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Zeiss Sonnar 50mm F/2 - regular Versions and Specs

 

This page contains an overview of all regular versions of the Zeiss Sonnar 5cm f/2 and some of its derivatives. Further below you can find a detailed description with photos of each version.  You can find more information on the history or the optical design and relevance of the Sonnar in other posts here. There is also another overview of all regular versions of the Zeiss Sonnar 5cm f/1,5.

Spec Sheet

In the following overview you can find all regular Sonnar 5cm f/2 / 50mm F/2 versions Zeiss has produced.  You can find the full sheet here.

Detailed Description

TOC

[v1b ZJ CR bnA2] 1932 Carl Zeiss Jena Contax black nickel A-shape F/22





  • black and nickel finish with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr
    • filter rim: nickel and black, no filter thread, uses 37mm push on filters
    • grip ring: black rippled, very narrow
    • aperture mark: white dot
    • aperture ring: half nickel and black, top silver (nickel) with black aperture scale, diagonal 16 & 22 line, bottom half with black rippled grip ring, clickless
    • locking plate: red dot
    • mount: nickel
  • aperture markings 2 - 22
  • uncoated optics
  • v1b optical lens calculation

The first Sonnar 5cm F/2 was released by Carl Zeiss Jena in Summer 1932. It was the first 5cm full frame lens by Zeiss and at that time the brightest 5cm / 50mm full frame lens of the world. It was released a half year before the release of its even brighter brother the Sonnar 5cm F/1,5. Both lenses were created by Ludwig Bertele for Zeiss Ikon in Dresden (Germany) to fit the new Contax camera that was secretly developed by Zeiss Ikon in Dresden.

The design matched the black and nickel look of the new Zeiss Ikon Contax I camera. It featured the new interchangeable lenses Contax Rangefinder (CRF) bayonet mount.

As a standard lens it used the internal CRF bayonet but has no focus ring or focusing helicoid. It depends on the camera (or adapter) for moving the lens to the right focus distance. Because of this design all CRF Sonnars are very small compared to modern lenses. Another (minor) advantage of the CRF mount was that it allowed the photographer to adjust the focus with the right hand using a small wheel on the Contax camera. You can focus the lens by rotating it by hand too like most manual lenses. The downside of this design is that the aperture ring rotates when you turn the lens. So it might easily end up out of sight of the photographer while focusing.

The Leitz Wetzlar Leica I was the direct competitor of the Contax I. The design of the Leica I had not only an effect on the design of the Contax camera but influenced the design of the Contax lenses too. A lot of the Contax design decisions were made by Zeiss to circumvent possible patent infringements with Leitz. The novelty CRF mount with the internal bayonet is such a solution to not copy the Leitz bayonet. And even the turn direction of the lens for achieving focus and setting the aperture is the opposite direction than the typical Leica turn direction.

The lens uses a circular aperture with 16 curved blades. The aperture ring of the lens is at the middle of the body and uses an exponential scale from f/2 to f/22. This means that the stops on this scale have different distances. The aperture ring is clickless and has no hard stops. This is common for this time and was solved decades later.

The lens has no filter thread. Lenses with filter thread were introduced years later. Zeiss offered the adapter 1314/17 to increase the size of the front to allow usage of 42mm slip on front caps, The small filter rim gives this lens a very distinct shape like a capital A.

The early Sonnar 5cm f/2 lenses are notorious for the soft front glass used at this time. It is prone to easily collect scratches from cleaning. 

This version is rather rare. Probably over 700 copies where made by Zeiss and about 1-3 copies are on sale every year.

[v1b ZJ CR bnX2] 1932 Carl Zeiss Jena Contax black nickel X-shape F/22





  • black and nickel finish with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr
    • filter rim: nickel, no filter thread, uses 42mm push on filters
    • grip ring: black rippled, very thick
    • aperture mark: white dot
    • aperture ring: half nickel and black, top silver (nickel) with black aperture scale, diagonal 16 & 22 line, bottom half with black rippled grip ring, clickless
    • locking plate: red dot
    • mount: nickel
  • aperture markings 2 - 22
  • uncoated optics
  • v1b optical lens calculation
  • extremely rare, only 2 are known
This variation is a mix of the previous [v1b ZJ CR bnA2] and next [v1b ZJ CR bnV6] body design. The filter rim portion looks the same as the later Sonnar but the aperture ring is the same as the previous Sonnar. This mix causes the typical X-shape of this variation. The old aperture ring surrounds the lens compared to the later ones and the lens closes down to f/22 compared to the later Sonnars.

The lens uses a wider front rim. A filter thread is still missing but it allowed to use 42mm lens slip on accessory like front lens caps more easily without an adapter.

This black and nickel variation of the Sonnar 5cm f/2 is extremely rare. Only 2 copies are known. Copies might be found at the end of production batches of the previous A-shaped Sonnars [v1b ZJ CR bnA2].

The rareness might be explained by the tendency of Zeiss to continuously improve existing product designs and introduce such improvements immediately. Sometimes improvements where introduced in the middle of a production batch. And sometimes those changes caused that features and designs of previous and new variations got mixed up in transition variations during such a change. It seems that Zeiss workers in factories used pre-produced parts up until they run out of them. So when the design changed they started production of the new parts but finished lenses and cameras with the still available old and new produced parts. This is true for the Contax I camera but it is also is true for the Sonnar lenses of this time. Drawing lines by production batch or even by overall design is not possible for Zeiss products of this time. 

[v1b ZJ CR bnV6] 1932 Carl Zeiss Jena Contax black nickel V-shape F/16




  • black and nickel finish with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr
    • filter rim: nickel and black with black a groove line in between, no filter thread, uses 42mm push on filters
    • grip ring: black rippled
    • aperture mark: white dot
    • aperture ring: half nickel and black, top silver (nickel) with black aperture scale, diagonal 16 line, bottom half with black rippled grip ring, clickless
    • locking plate: red dot
    • mount: nickel
  • aperture markings 2 - 16
  • uncoated optics
  • v1b optical lens calculation
This is the second black and nickel variation of the Sonnar 5cm f/2 intended for the black Zeiss Ikon Contax I camera. While the first variation [v1b ZJ CR bnA2] has an A-shaped body this new variation uses a V-shaped body for the first time. Additionally this lens uses a wider minimum aperture of F/16 despite using the same optical lens calculation as the former lenses that close down to F/22. Another small change easily overlooked is the changed aperture ring. The new designed aperture ring slips under the front grip ring instead of sitting on it.

The lens uses a wider front rim. A filter thread is still missing but it allowed to use 42mm lens slip on accessory like front lens caps more easily without an adapter.

Most other details like used optical calculation, aperture blades or markings are the same as the first variation [v1b ZJ CR bnA2]. Carl Zeiss Jena innovated the body design in small steps as it has done with the Sonnar 5cm F/1,5 too.

About 700 copies of this variation were manufactured and they show up regularly with 4-5 copies a year.

[v2b ZJ CR bnV6] 1933 Carl Zeiss Jena Contax black nickel V-shape F/16




  • black and nickel finish with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr
    • filter rim: nickel with groove line at 1/3 height, no filter thread, uses 42mm push on filters
    • grip ring: black rippled
    • aperture mark: white dot
    • aperture ring: half nickel and black, top silver (nickel) with black aperture scale, diagonal 16 line, bottom half with black rippled grip ring, clickless
    • locking plate: red dot
    • mount: nickel
  • aperture markings 2 - 16
  • uncoated optics
  • v2b optical lens calculation
This third black and nickel variation of the Sonnar 5cm f/2 intended for the black Zeiss Ikon Contax I camera looks very much the same as the second variation [v1b ZJ CR bnV6]. It shares the same V-shaped body and minimum aperture of F/16. The main difference between both variations is the new used lens calculation this lens uses. 

It uses the second optical calculation from Ludwig Bertele. Why Bertele created this recalculated optical formula is unknown but it was only used in this variation and was already replace with the next variation [v3b ZJ CR bnV2].

About 1600 copies of this variation were manufactured and they show up regularly with 4-6 copies a year.

[v3b ZJ CR bnV2] 1933 Carl Zeiss Jena Contax black nickel V-shape F/22




  • black and nickel finish with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr
    • filter rim: nickel with groove line below, no filter thread, uses 42mm push on filters
    • grip ring: black rippled
    • aperture mark: white dot
    • aperture ring: half nickel and black, top silver (nickel) with black aperture scale, diagonal 16 & 22 line, bottom half with black rippled grip ring, clickless
    • locking plate: red dot
    • mount: nickel
  • aperture markings 2 - 22
  • uncoated optics
  • v3b optical lens calculation
This is the 4th black and nickel variation of the Sonnar 5cm f/2 intended for the black Zeiss Ikon Contax I camera. The body looks very much the same as the 2nd and 3rd variation. It shares the same V-shaped body and minimum aperture of F/16. The main difference to those previous variations is the use of a new lens calculation. It uses Ludwig Berteles 3rd optical calculation of the Sonnar 5cm f/2. This optical design was a major improvement in sharpness and optical quality. The new optics allowed for a smaller minimum aperture setting of F/22 again. 

This optical formula from December 1933 was used for all following Sonnar 5cm f/2 for the next 2 decades.

About 1300 copies of this variation were manufactured. This small number makes this nickel and black variation showing up 3-5 copies a year.

[v3b ZJ CR bnU] 1934 Carl Zeiss Jena Contax black nickel U-shape F/22




  • black and nickel finish with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr
    • filter rim: black, rippled, with 2 small slots, no filter thread
    • aperture ring: filter rim used as aperture ring, white aperture scale at the inside of the filter rim, clickless
    • aperture mark: white line, at lens name ring
    • grip ring: nickel rippled
    • body: 2 black painted bands below grip ring
    • locking plate: red dot
    • mount: nickel
  • aperture markings 2 - 22
  • uncoated optics
  • v3b optical lens calculation
In 1934 Carl Zeiss Jena created this uniquely bell shaped Sonnar 5cm F/2. It still has a nickel finish with black paint to match this lens with the Contax I camera. But the design is very different from the previous nickel Sonnar 5cm lenses. 

The aperture ring moved from the base to the front of the lens. In fact what looks like a filter rim is in fact the aperture ring. The aperture scale is only visible looking from the front and is located partly on the inside of the rim and on the lenses name ring. The aperture mark is engraved on the name ring too. This lens uses a new aperture iris with 13 rounded aperture blades.

The lens has no real filter rim. As described the rim of this lens is used as grip of the aperture ring. This rim has 2 small slots but the function of those is not known. 

This purpose of this unique design is unkown. There are no other Sonnar lenses with a similar shape or this kind of aperture ring. The only other lens with a similar aperture scale is the Biogon 3,5cm F/2,8 that was released 2 years later. This unique design makes for an interesting looking collectors item but does not improve the handling. The aperture ring is not easy to turn and the scale is only visible looking directly from at the front of the lens. Though one could argue that it is still easier to see than the scales on the outside barrel of other bodies that one has to search after turning the lens while focusing.

This Sonnar can easily be found and is the most common nickel Sonnar 5cm F/2. About 3600 copies were made and over 10 copies show up every year.

[v3b ZJ CF c3] 1934 Carl Zeiss Jena Contaflex chrome 13 aperture blades



  • complete chrome finish with Contaflex mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr.
    • filter rim: chrome, rippled, with aperture mark
    • aperture mark: small black dot on filter rim
    • aperture ring: small, chrome, black aperture scale, with 2 small finger grips, clickless
    • distance scale: chrome, small black letters, m 1 1,2 1,5 2 3 4 6 10 20, feet 6 8 10 15 30 60 Inf, straight distance lines, very small rippled grip ring
    • fov scale ring: chrome, black scale, 2,8 - 22, diagonal lines, red line distance mark, small red dot mounting mark
    • mount: chrome
  • aperture markings 2 - 22
  • uncoated optics
  • v3b optical lens calculation

In 1935 Zeiss Ikon released the Contaflex TLR, a two-eyed twin lens reflex camera with waist level viewfinder. It was designed to be the flagship camera of Zeiss offering the highest quality. To boldly show this it was the first camera in an all chrome finish. It introduced new features like a build in exposure meter. Contaflex TLR cameras were offered with either a Sonnar 5cm F/2 or Sonnar F/1.5 as standard lens. Like the camera the Contaflex version of the Sonnar used an all chrome finish and was rather big and heavy compared to the Contax Sonnars. This version uses the new Contaflex bayonet.

This lens features a new designed aperture ring. The aperture ring was moved to the front of the lens and slimmed down. Since it was smaller now it got 2 small grippers. The front ring got a 40.5 mm filter thread that allowed screwing on filters or sun shades. 

This early version uses the third optical calculation of the Sonnar 5cm F/2 optics. It is not only the first version of the Contaflex Sonnar 5cm F/2 it is the only one featuring 13 rounded aperture blades. Later lenses used the simpler 9 aperture blade iris.

Not more than 500 copies have been  created in 1 production runs. Because of this low number this lens is pretty rare today and only show up 1-2 times a year.

[v3b ZJ CR br] 1935 Carl Zeiss Jena Contax black ring nickel F/22




  • nickel and chrome finish with black ring with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr.
    • filter rim: chrome, rippled, 40.5 mm filter thread
    • aperture ring: small, chrome, black aperture scale, with 2 small finger grips, clickless
    • aperture mark: big black dot
    • grip ring: nickel rippled
    • black painted ring / band below grip ring
    • locking plate: small square red rectangle at tip
    • mount: nickel, diagonal cut, Made in Germany / Alemania
  • aperture markings 2 - 22
  • uncoated optics
  • v3b lens calculation

In January 1935 Zeiss improved the overall design of the Sonnar 5cm F/2 drastically. This was achieved by copying a lot of the Contaflex TLR Sonnar [v3b ZJ CF c3] improvements. The aperture ring was moved to the front of the lens and slimmed down. Since it was smaller now it got 2 small grippers. The front ring got a 40.5 mm filter thread that allowed screwing on filters or sun shades. The lens uses a new aperture iris with 9 curved aperture blades that create a circular aperture.

Those design changes improved the handling further. The new filter ring offered a standardized way to use new accessory available from Zeiss Ikon and the front aperture rings scale make it easier to see the used aperture and is safer to focus without accidentally changing the aperture setting.

This Sonnar is the last nickel and black paint variation of the Sonnar 5cm F/2 from Zeiss. The design still uses a nickel barrel but compared with the previous nickel variations there is only one painted black color ring. The broad black ring right below the grip ring dominates the new round body. The front of the lens shows a chrome filter rim and aperture ring. Together with the faintly brown nickel finish this mix gives this version its unique look. The overall body design looks very much like the later all chrome Contax Sonnar lens [v3b ZJ CR cO].

The Contaflex TLR influenced the design of this black ring variation and might even be the cause of the lens redesign. The nickel, black and chrome look of this Sonnar lens matches the black Contax I look but that of the all chrome Contax II released a year later too. Later in the production runs even some copies can be found that have an all chrome finish with a black painted ring. It looks like Zeiss was already preparing the production of chrome lenses and cameras in spring 1935.

This version was build in 3 production runs during 1935. About 2.200 were made in this time. Today copies can be found 6-8 times each year.

There is a nickel with black ring Sonnar 5cm F/1,5 [v2b ZJ CR br] too. It was build at the same time  and is a bit rarer.

[v3b ZJ CR cO] 1935 Carl Zeiss Jena Contax chrome diagonal F/22




  • complete chrome finish on black ring (v3b ZJ CR br) barrel with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr.
    • filter rim: chrome, rippled, 40.5 mm filter thread
    • aperture ring: small, chrome, black aperture scale, with 2 small finger grips, clickless
    • aperture mark: big black dot
    • grip ring: chrome rippled
    • locking plate: small square red rectangle at tip
    • mount: chrome, diagonal cut, Made in Germany / Alemania
  • aperture markings 2 - 22
  • uncoated optics
  • v3b lens calculation

This version is the successor of the black ring Sonnar [v3b ZJ CR br]. It uses the same body shape but without black ring and and now an all chrome finish.

With this design Zeiss finally switched from the nickel and black finish to a fully chrome finish. This design matches with the 1935 released Contax II that uses chrome face plates. The use of chrome instead of nickel might cut some production times since it got rid of the black painted parts on several parts of the Sonnar lens. But it probably made this expensive lens a little bit more expensive. The competition with Leica was stiff and Zeiss positioned the Contax and their lenses as quality products that were worth the money. And the chrome look oozed this sense of quality and luxury.

There are multiple all chrome Sonnar 5cm F/1,5 [v3b ZJ CR cd] [v3b ZJ CR cb] too. The body shape of the F/1,5 and F/2 version looks very similar. But while the later all chrome Sonnar F/1,5 was build in large numbers the all chrome rigid Sonnar F/2 was dropped soon and was replaced by the very successful collapsible Sonnar F/2 [v3b ZJ CR cc].

Maybe 1.200 copies might be build from January 1935 till May 1936. Today this lens is rather rare since only 3-5 turn up a year.

[v3b ZJ CF c] 1935 Carl Zeiss Jena Contaflex chrome 9 aperture blades


  • complete chrome finish with Contaflex mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr.
    • filter rim: chrome, rippled, with aperture mark
    • aperture mark: small black dot on filter rim
    • aperture ring: small, chrome, black aperture scale, with 2 small finger grips, clickless
    • distance scale: chrome, small black letters, m 1 1,2 1,5 2 3 4 6 10 20, feet 6 8 10 15 30 60 Inf, straight distance lines, very small rippled grip ring
    • fov scale ring: chrome, black scale, 2,8 - 22, diagonal lines, red line distance mark, small red dot mounting mark
    • mount: chrome
  • aperture markings 2 - 22
  • uncoated optics
  • v3b optical lens calculation
This is the second Contaflex TLR Sonnar 5cm F/2 version. The body is the same as the first version [v3b ZJ CF c3]. The key difference here is that this second version uses a later aperture iris with 9 aperture blades. This change was introduced to the Contaflex and Contax line at the same time.

Although there is detailed data of CZJ lens production runs it is difficult to find reliable data of how many Contaflex Sonnar lenses were build back then. By estimation this variation was manufactured over 1200 times. Copies show up 4 - 6 times a year.

[v3b ZJ CR cc] 1935 Carl Zeiss Jena Contax chrome collapsible flat head F/22






  • complete chrome finish collapsible barrel with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr., flat
    • filter rim: chrome, rippled, 40.5 mm filter thread
    • aperture ring: small, chrome, black aperture scale, with 2 small finger grips, clickless
    • aperture mark: small black dot at grip ring
    • grip ring: small, chrome, rippled
    • locking plate: red dot
    • mount: chrome, horizontal cut, black painted bottom, collapsible, 2 holding screws
  • aperture markings 2 - 22
  • uncoated optics
  • v3b lens calculation
In Spring of 1935 a new all chrome variation of the Sonnar 5cm F/2 was released for the all chrome Contax II and Contax III. It followed the U-bell shaped nickel Sonnar [v3b ZJ CR bnU] and was build alongside the Contaflex TLR Sonnar [v3b ZJ CF c] and the Contax nickel and black band Sonnar [v3b ZJ CR br]. Unlike those rigid lenses this new Sonnar 5cm F/2 featured a collapsible body. 

The novelty of this variation was the shrinked size. The engineers of Carl Zeiss Jena managed to make the tiny Contax Sonnar 5cm F/2 even smaller. This is mainly due to its main feature the collapsible body. When the lens is not in use it can be collapsed. The user needs to turn and then push the lens head in direction of the camera body to do this. That way the lens head sits flat with the camera body. Before using the collapsed lens the user needs to unfold the lens and fixate it again.

During that time it was quite common to offer 5cm lenses with a collapsible body. The Leitz Wetzlar Summitar and Summar come to mind and even Carl Zeiss Jena already offered the Contax Tessar 5cm F/3,5 and F/2,8 with a collapsible lens body. Maybe Zeiss wanted to show their superiority in lens design by offering a collapsible Sonnar. Maybe they wanted to minimize the Sonnar F/2 as far as possible. The size of the Sonnar 5cm F/2 shrinks down about 1cm by collapsing it. This might not be a huge win but the Contax body and the collapsed lens create a nice compact package that way. There is no collapsible Sonnar 5cm F/1,5.

To let the lens sit even more flat on the cameras body the designers created a new flat name ring for this lens. While the old name rings are shaped quite steep this new name ring is horizontal engraved. To make the head as flat as possible all parts of the head are as narrow as possible. The grip ring to hold the lens during focusing, the aperture ring with scale and the filter rim are very small. The lens uses the aperture ring with the 2 small grippers introduced by the nickel and black band Sonnar [v3b ZJ CR br]. Despite the small size the lens is quite heavy because of the brass and chrome build.

This new body uses a new Contax mount lock pin with a big red dot. Sometimes it can be a little bit difficult to lock or unlock the lens from the mount because of the collapsing mechanism. In collapsed state it is impossible to unlock the lens. Locking and unlocking can only be done in extended position and might need some practice. Focusing can be a little challenging too. There is no hard lock in extended position and turning the lens during focusing might result in loosening the lens and accidential collapsing it. Using the Sonnar on a Contax camera one can focus the lens using the focusing wheel on the camera though to work around this issue.

This new all chrome collapsible Sonnar 5cm F/2 was a huge success for Carl Zeiss Jena. They build it over several years till the end of WWII. Around 55.000 copies were produced. A lot of Contax II and Contax III were fitted with this kind of Sonnar and can easily be found today.

[v3b ZJ CR ccCF] 1935 Carl Zeiss Jena Contax chrome collapsible high head F/22






  • complete chrome finish collapsible barrel with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr., diagonal
    • filter rim: chrome, rippled, 40.5 mm filter thread
    • aperture ring: small, chrome, black aperture scale, with 2 small finger grips, clickless
    • aperture mark: small black dot at grip ring
    • grip ring: small, chrome, rippled
    • locking plate: red dot
    • mount: chrome, horizontal cut, black painted bottom, collapsible, 2 holding screws
  • aperture markings 2 - 22
  • uncoated optics
  • v3b lens calculation
This unusual collapsible Sonnar 5cm F/2 was build during the year 1935 too. The lens head is higher than the first collapsible Sonnar [v3b ZJ CR cc]. Because of this this lens is some 4 - 5mm taller than the first variation. Very noticeable are the long lines on the aperture scale.

The lens uses the old steep name ring. That is the same name ring used by the Contaflex TLR Sonnar [v3b ZJ CF c] or the Contax nickel and black band Sonnar [v3b ZJ CR br]. That explains the unusual head shape.

One could think that this high head variation predates the flat head variation. That the flat head Sonnar bodies replaced the steep name ring Sonnar bodies. There is no evidence to back up this theory completely. In 1935 CZJ created multiple different new Sonnar 5cm F/2 bodies and a lot of those bodies seem to be produced side by side. While there is almost no overlap of those 2 versions during production batches the flat name ring version can be found with lower serial numbers and mounted to older Contax camera bodies. 

Maybe 650 copies might be build from January 1935 till May 1936. Today this lens is rather rare since only 3-4 turn up a year.

[v3b ZJ CR ccT] 1936 Carl Zeiss Jena Contax chrome collapsible T F/22






  • complete chrome finish collapsible barrel with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm T Nr. (red T), flat
    • filter rim: chrome, rippled, 40.5 mm filter thread
    • aperture ring: small, chrome, black aperture scale, with 2 small finger grips, clickless
    • aperture mark: small black dot at grip ring
    • grip ring: small, chrome, rippled
    • locking plate: red dot
    • mount: chrome, horizontal cut, black painted bottom, collapsible, 2 holding screws
  • aperture markings 2 - 22
  • single coated optics
  • v3b lens calculation

Cosmetically this version is the same as the previous all chrome collapsible version [v3b ZJ CR cc]. The used optics are the same too but with the new single coating applied. 

This version introduced anti-reflecting coating to the Sonnar 5cm F/2 line for the first time. This addition is marked by the red letter T on the name ring of the lens. The T stands for Transparenzbelag (transparency coating) and is applied as single coating only.

In 1935 Alexander Smakula invented the anti-reflecting coating at Carl Zeiss Jena. It was a major breakthrough that made optical lens constructions with more than 4 lenses or lens groups feasible. Through this coating the amount of light loss on every glass-air surface could be reduce from 4% to 1.5%. The coating of lenses promised to increased contrast and flare resistance of all lenses. The effect on the Sonnar was not that huge though. Possible reasons might be that the first coatings were not that advanced and that the Sonnar construction with its 3 groups already is optimized to a high degree.

Although Smakula invented the anti-reflecting coating already in 1935 and Zeiss recognized the importance of this invention it took them until 1939 to finally start coating all new Sonnar lenses. It took them years to introduce and improve the production process as it utilizes high-vacuum technology. In 1938, 17 coating plants were already in use but for military optical devices only. This new invention was treated as a military secret at first. In 1940, the first coated Biotar and Sonnar lenses were presented at the Leipzig Spring Fair but coating of the Sonnar 5cm F/1.5 already started in summer 1939, in the middle of the 45th production run. The serial number is around 2.553.357. Coating of Sonnar 5cm F/2 lenses started even later around serial 2.684.646.

There exist few single copies with way earlier serial numbers that show a red T mark and the typical yellow-brown single coating of Zeiss lenses. The shown example is one of that copies. Soon after the end of WWII CZJ started to apply the anti-reflection coating to all sorts of optical devices like glasses and all photographic lenses. In that time Zeiss offered a service for customers to send in lenses and to apply anti-reflection coating to uncoated lenses. In this process the name ring of those Zeiss lenses were engraved with a red T too. All CZJ lenses with a red T mark and a serial lower than 2.684.646 can be considered to be coated after WWII by CZJ on request.

A solid estimation of how many of those coated lenses exists is not possible. It can be estimated that around 140 copies might exists. Copies show up rarely with only 1-2 copies a year.

[v3b ZJ CF cf] 1936 Carl Zeiss Jena Contaflex chrome flat head





  • complete chrome finish with Contaflex mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr., flat
    • filter rim: chrome, rippled, with aperture mark
    • aperture mark: small black dot on filter rim
    • aperture ring: small, chrome, black aperture scale, with 2 small finger grips, clickless
    • distance scale: chrome, small black letters, m 1 1,2 1,5 2 3 4 6 10 20, feet 6 8 10 15 30 60 Inf, straight distance lines, very small rippled grip ring
    • fov scale ring: chrome, black scale, 2,8 - 22, diagonal lines, red line distance mark, small red dot mounting mark
    • mount: chrome
  • aperture markings 2 - 22
  • uncoated optics
  • v3b optical lens calculation
This is the third and last Contaflex TLR Sonnar 5cm F/2 version. The body is the same as the first and second version [v3b ZJ CF c3]. The big difference is the name ring of this lens. It uses the same flat name ring as the collapsible Contax Sonnar 5cm F/2 lenses f.e. the [v3b ZJ CR cc]. Through the use of this flat name ring the filter rim is deeper. This change was probably made to cut costs by reusing the same parts for Contax and Contaflex lenses.

Although there is detailed data of CZJ lens production runs it is difficult to find reliable data of how many Contaflex Sonnar lenses were build back then. By estimation about 1000 copies were manufactured. Lenses show up 1 - 3 times a year.

[v3b ZJ CR ac] 1939 Carl Zeiss Jena Contax aluminum collapsible flat head F/22






  • aluminum body finish collapsible barrel with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm Nr., flat
    • filter rim: silver, rippled, 40.5 mm filter thread
    • aperture ring: small, silver, black aperture scale on separate, screwed on, ring with 2 small finger grips, clickless
    • aperture mark: small black dot at grip ring
    • grip ring: small, chrome, rippled
    • locking plate: red dot
    • mount: chrome, horizontal cut, black painted bottom, collapsible, 2 holding screws
  • aperture markings 2 - 22
  • uncoated optics
  • v3b lens calculation
In the second half of 1939 Carl Zeiss Jena came up with a new body design of their collapsible Sonnar 5cm F/2. Those wartime aluminum Sonnar 5cm F/2 bodies still had no T coating (anti reflection coating) applied. This changed after WWII with another variation [v3b ZJ CR acT].

This version [v3b ZJ CR ac] got some improvements and changes. On first glance the new body looks the same as the previous all chrome collapsible Sonnar [v3b ZJ CR cc]. The cosmetic differences are difficult to spot. The aperture ring with aperture scale and the 2 small grippers is now a separate ring that is screwed to the lens. The ring seems to miss the chrome finish and looks rather mate.

The biggest change was the reduced weight of the new version. The all chrome finish was dropped and the used metal was of lesser quality. Most of the lens body was now made from aluminum. Because of this the new lens was a lot lighter than previous versions. This change might be caused by the start of the Second World War. Germany's industry was steering to serve military production and metal became rare and expensive since it was needed for military arms and vehicles. And since Carl Zeiss Jena was part of the German military suppliers it adapted to the new situation quickly. A less known fact is that a large part of the German aluminum manufacturing industry was located in the eastern parts of Germany. Aluminum was easily available and cheaper in production. This might be another reason why Zeiss switch to aluminum and replace brass for body parts.

With the start of WWII the build quality of Sonnar lenses start to drop compared to previous versions. Parts of lenses were made from cheap metal, dimensions of parts start to vary and the failure rate goes up. One cause of this is that a growing number of experienced specialists start to leave the production to serve as soldiers in the German army. They were replaced by foreign workers, refugees and forced laborers. Later the supply with metal and material for production became an issue too. The later the war the worse the quality issues got. This version was only affected slightly.

This variation was in production till the end of WWII in 1945. Despite the long time only about 1200 copies might have been build in 2 production runs. This is because Zeiss mostly stopped the production of Contax cameras and lenses in 1940 and picked up production after the war in some cases (batch 64 is such an example). Today you might find 4-6 copies a year.

[v3b ZJ CR acT T] 1940 Carl Zeiss Jena Contaflex aluminum collapsible transition T F/22






  • aluminum body finish collapsible barrel with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm T Nr. (red T), flat
    • filter rim: silver, rippled, 40.5 mm filter thread
    • aperture ring: small, silver, black aperture scale on separate, screwed on, ring with 2 small finger grips, clickless
    • aperture mark: small black dot at grip ring
    • grip ring: small, chrome, rippled
    • locking plate: red dot
    • mount: chrome, horizontal cut, black painted bottom, collapsible, 2 holding screws
  • aperture markings 2 - 22
  • single coated optics
  • v3b lens calculation
This is a transition variation that merge design features of the wartime collapsible aluminum Sonnar 5cm F/2 [v3b ZJ CR ac] with the postwar collapsible aluminum Sonnar 5cm F/2 [v3b ZJ CR acT]. The collapsible body, especially the bottom part is the same as the wartime copies but this Sonnar variation already received the Zeiss T coating like postwar Sonnars. 

This variation was probably created by accident. When the postwar production started Zeiss took the remaining wartime body parts, finished those lenses and added the new T coating. When those parts were used up they switched to new manufacture parts of the postwar body design.

Since this variation is created by production inconsistency or transition from one design to the next design the number of created lenses might be as low as 500 copies. Only 2 copies were spotted so far.  

[v3b ZJ CR acT] 1940 Carl Zeiss Jena Contax aluminum collapsible flat head T F/22







  • aluminum body finish collapsible barrel with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm T Nr. (red T), flat
    • filter rim: silver, rippled, 40.5 mm filter thread
    • aperture ring: small, silver, black aperture scale on separate, screwed on, ring with 2 small finger grips, clickless
    • aperture mark: small black dot at grip ring
    • grip ring: small, chrome, rippled
    • locking plate: red dot
    • mount: chrome, horizontal cut, unpainted bottom, collapsible, 2 holding screws
  • aperture markings 2 - 22
  • single coated optics
  • v3b lens calculation
This is a slightly updated version of the collapsible aluminum body Sonnar 5cm F/2 [v3b ZJ CR ac].
The used optics are the same but with the new Zeiss single coating applied. For the first time all produced Sonnar 5cm F/2 lenses received this improvement. This addition is marked by the red letter T on the name ring of the lens. The T stands for Transparenzbelag (transparency coating) and is applied as single coating only.

In 1935 Alexander Smakula invented the anti-reflecting coating at Carl Zeiss Jena. It was a major breakthrough that made optical lens constructions with more than 4 lenses or lens groups feasible. Through this coating the amount of light loss on every glass-air surface could be reduce from 4% to 1.5%. The coating of lenses promised to increased contrast and flare resistance of all lenses. The effect on the Sonnar was not that huge though. Possible reasons might be that the first coatings were not that advanced and that the Sonnar construction with its 3 groups already is optimized to a high degree.

Although Smakula invented the anti-reflecting coating already in 1935 and Zeiss recognized the importance of this invention it took them until 1939 to finally start coating all new Sonnar 5cm F/1,5 lenses. It took them years to introduce and improve the production process as it utilizes high-vacuum technology. In 1938, 17 coating plants were already in use but for military optical devices only. This new invention was treated as a military secret at first. In 1940, the first coated Biotar and Sonnar lenses were presented at the Leipzig Spring Fair but coating of the Sonnar 5cm F/1.5 already started in summer 1939, in the middle of the 45th production run. The serial number is around 2.553.357. Coating of Sonnar 5cm F/2 lenses started even later around serial 2.684.646 at the end of WWII. This was done on the pressure of the Soviet administration that occupied Jena though. They demanded that all produced Zeiss lenses should receive this new anti reflection coating. 

This version was produced in the last days of WWII and until 1946. The Soviet administration demanded that Zeiss Jena should immediately start production of Contax lenses. In Spring 1946 the relocation of the whole Sonnar production to the FSU interrupted all work and further improvements. The Soviet administration forced CZJ to pack all machines, tools, unfinished parts, lenses and send it east to Krasnogorsk. In Krasnogorsk KMZ started with building up a production line, training employees to build Zeiss lenses and assembling the incomplete lenses from Jena. Because of this some of the existing CZJ Sonnar 5cm F/2 lenses might be assembled and finished by KMZ.

It should be noted that the relocation caused a massive chaos that caused that a noticeable amount of  postwar Sonnars can be found with a Jupiter-8 body or no body at all. The above pictures show such an example where the CZJ Sonnar 5cm F/2 lens block was not assembled in a collapsible lens body. Those lens blocks have an M27 filter thread and can easily be screwed into a Jupiter-8 donor body.

A high estimated number of lenses of 3000 lenses were produced of this variation. About 6-9 copies can be found a year.

[v3b ZJ SP sT] 1941 Carl Zeiss Jena Super Parvo





  • all silver finish with Parvo mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm T Nr. (red T), flat
    • shade: silver, painted black inside and on front
    • aperture ring: silver, painted black, holding pin
    • aperture mark: black line at shade
    • aperture scale: ivory crescent strip with black scale screwed on silver body, 2,3 - 16
    • mount: silver, with big dish-like mounting plate, black ball bearing
  • aperture markings 2,3 - 16
  • single coated optics
  • v3b lens calculation

While the Sonnar 5cm F/1,5 was adapted to multiple motion picture cameras in the 1940ies the Sonnar 5cm F/2 was only adapted to one. That one is the Debrie Super Parvo motion picture camera. This French 35mm cine camera was created by André Debrie in 1932 and was the European standard motion picture camera of the 1930, 40 and 50ies.

The lens is made of brass with Chrome finish. It had an ivory crescent formed aperture scale. The lens is quite big because of the dish formed plate that is needed to lock the lens on to a Parvo camera.

Despite the popularity of the Super Parvo camera CZJ only manufactured a low number of Sonnar 5cm F/2 with Parvo mount. Only 32 were officially made. That number is even lower than the 160 copies of the Super Parvo Sonnar 5cm F/1,5 [v4b ZJ SP cg]. CZJ manufactured this lens only until the end of WWII. This lens used the latest optics with T single coating what shows the importance for Zeiss to manufacture the best motion picture lenses.

Because of this low number of copies this lens is extremely rare today. There are almost no pictures or data of this lens online.

[v3b ZJ LT ac] 1940 Carl Zeiss Jena LTM aluminum collapsible F/22







  • aluminum body finish collapsible barrel with LTM adapter
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm T Nr. (red T), flat
    • filter rim: silver, rippled, 40.5 mm filter thread
    • aperture ring: small, silver, black aperture scale on separate, screwed on, ring with 2 small finger grips, clickless
    • aperture mark: black arrow over grip ring
    • grip ring: small, chrome, rippled
    • distance scale: chrome, black scale, 1 - 20, small m (sometimes missing), sometimes big M
    • fov scale ring: chrome, black scale, 2 - 22, diagonal lines, red arrow distance mark
    • mount: silver, no rippled grip ring, focus lover with knob,  lever can be locked at infinity, unpainted bottom, collapsible
  • aperture markings 2 - 22
  • single coated optics
  • v3b lens calculation

This is the only Leica Thread-Mount (M39) version of the Sonnar 5cm F/2 from Zeiss that went in production ever. This LTM version was produced in the last days of WWII and until 1946.

This lens is lightweight because it was made of aluminum. Like most lenses of that time it was not painted and appeared in an all silver finish. CZJ added a focusing helicoid adapter with a focus lever that can be locked so it can be focused on a Leica III camera. The new focus scale is in meter.  The aperture ring and focus ring turn in the opposite direction of other Leica lenses, the typical Contax lens direction. The lens is still collapsible and uses the same flat name ring like most collapsible variations. 

CZJ used the best available optics for this Leica version too. So Leica users got the latest optics with coating from Zeiss. This was done on the pressure of the Soviet administration that occupied Jena though. They demanded that all produced Zeiss lenses should receive this new anti reflection coating. 

This variation has an interesting history that is almost forgotten. It was not made for the Leica I but for the Soviet KMZ Zorki I camera. When the Soviets occupied Jena in the last days of WWII they ordered a huge amount of Zeiss lenses. The ordered Sonnar lenses were mend to be used with Zorki I and FED cameras. Zeiss started the design of the LTM mount and production immediately. Through a mistake the mount of the Zorki cameras is not a perfect M39 copy but has some significant differences why it is named L39. CZJ did not know about those differences at that time and so their lens mount is for Leica's M39 instead. Zeiss discovered the mistake very late but had no time to fix it. The relocation of the whole Sonnar production to the FSU in spring 1946 interrupted all work and further improvements. The Soviet administration forced CZJ to pack all machines, tools, unfinished parts, lenses and send it east to Krasnogorsk. In Krasnogorsk KMZ started with building up a production line, training employees to build Zeiss lenses and assembling the incomplete lenses from Jena.

Other than the Sonnar 5cm F/1,5 the F/2 has not a lot of copycat  variations. Even this LTM version was not copied by others. There is some variation of this collapsible LTM though. Some copies do not have a meter abbreviation others show a big M instead of a small m. This hints to KMZ itself as source of those Sonnar F/2 copies. It seems they started training of employees by assembling unfinished lenses and using up parts from the Zeiss factory in Jena. While some of those lenses might look identical to those completed in Jena others were engraved by KMZ. Later manufactured Sonnars got a properly engraved name ring with ZK Zorkii name. The earliest ZK 5cm F/2 was manufactured 1947 for Contax and 1948 in collapsible mount for L39. The Soviet lenses use a name ring with the name Jupiter-3 instead of Sonnar and a red P instead of red T. A big M is used as meter abbreviation instead of a small m like CZJ Sonnar lenses. While very early Sonnar and ZK copies used original Zeiss lenses or glass later ones used a different optical calculation starting already in 1948. This was done because the production had no access to Schott glass anymore. A recalculation was done to use glass available in the Soviet union. 

About 3.000 copies of this LTM Sonnar lens might be produced. Today this lens is quite rare with only 2-3 showing up a year.

[V3b ZJ M7 bg] 1945 Carl Zeiss Jena M27 black geared ring Bakelite F/22





  • black Bakelite / plastic finish collapsible barrel with missing mount / M27 thread
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm T Nr. (red T), flat, contains aperture scale
    • filter rim: missing, no filter thread
    • aperture ring: black large geared ring, white aperture scale at name ring, clickless
    • aperture mark: small white dot at inner lens tube
    • mount: missing, M27 screw, black metallic body
  • aperture markings 2 - 22
  • single coated optics
  • v3b lens calculation
This post-war Sonnar from Carl Zeiss Jena has a unique design but the purpose of it is unknown. There is almost no information about it other than a production note: Zahnkranz / ring gear.

This Sonnar 5cm F/2 still uses a flat name ring like previous collapsible Sonnar variations but it is rigid. The lens part is all black with white letters and dominated by a geared grip ring. The material is not metal but seems to be a kind of plastic maybe Bakelite an early type of PVC. It kept the flat name ring but it is the only Sonnar 5cm where the name ring contains the aperture scale. The aperture mark, a small white dot, is almost hidden on the inner rim. The huge grip ring is the aperture ring of this Sonnar. Because of the design of the name ring with integrated aperture scale the lens misses a filter ring to attach lens filters. The lens shows a red T for the used single coating from CZJ and the color of the lens coating proves that it was made bei Zeiss.

The lens has a M27 screw mount that is designed to work as a internal mounting option for the lens mount body. This means it can be screwed into multiple Sonnar 5cm mounts. This Sonnar was mainly spotted with Jupiter-8 bodies: for Contax PT3515 mounts, for LTM PT3030, PT3060 and PT3080 mounts. All those mount bodies can be used to focus this Sonnar. The only odd aspect is that all those bodies have an own aperture mark that often is used as a focus mark too. When the lens block is screwed to the mount body both aperture marks are often to be found to be misalign. A small flaw that renders the lens bodies aperture mark useless.

Some might wonder if the use with Jupiter-8 bodies render those Sonnars as fake or copycats. To be clear the lens block was completely made by Zeiss! The dismantling and relocation of the Jena Zeiss factory by the Soviets to the FSU falls in the production period of this Sonnar. Those lens blocks ended up in the FSU and were used to outfit Zorkii and Kiev cameras. 

It can be speculated if the use by the Soviets was by design. The unusual design of this lens might hint to use with motion picture cameras or with remote control but this is pretty unlikely because the geared ring only controls the aperture setting of the lens. The missing filter ring might be a disadvantage for filming too. A more likely purpose for this Sonnar might be as a cheap and fast to produce modular lens block with a big and easily accessible aperture ring that could be easily be fitted to multiple mount bodies. This is pure speculation but KMZ might have needed production support from Jena in the beginning when they started the Sonnar production in Krasnogorsk. Zeiss might come up with the design of this modular lens block with big aperture ring in the hope to keep the manufacturing in Jena. Maybe even the design of the mount body for the mentioned Jupiter-8 Contax RF and LTM mount bodies is a Jena product to be fitted with Jena Sonnars. But the Soviet administration stood by their decision and move all the Sonnar production facilities to the FSU.

This Sonnar can be found with different mount bodies. It shows up very rarely with 1-2 copies a year. But it is easily dismissed by many customers as a Jupiter-8 copy. Only about 500 were created in a single production run in early 1946.

[v3b ZJ CR accT T] 1946 Carl Zeiss Jena Contax aluminum collapsible flat head transition F/22





  • heavy aluminum body finish collapsible barrel with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm T Nr. (red T), flat
    • filter rim: silver, rippled, 40.5 mm filter thread
    • aperture ring: small, silver, black aperture scale on separate, screwed on, ring with 2 small finger grips, chromed, clickless
    • aperture mark: small black dot at grip ring
    • grip ring: small, chrome, rippled
    • locking plate: red dot
    • mount: chrome, horizontal cut, unpainted bottom, collapsible, 1 holding screw
  • aperture markings 2 - 22
  • single coated optics
  • v3b lens calculation
This is the very last collapsible Sonnar 5cm F/2 that was build by Zeiss. It was build during the relocation of the Zeiss plant from Jena in Germany to Krasnogorsk in the FSU. 

Cosmetically this variation looks almost identical to the previous one the postwar aluminum Sonnar 5cm F/2 [v3b ZJ CR acT]. But this variation is a little heavier and the finish looks more like chrome than the aluminum Sonnars. The other indicator is the mount part of this lens. It has only 1 holding screw instead of 2. The spotted examples of this variation show a unusual degradation of the black paint of the name ring. You can see this effect with the example above too.

It is debatable if this variation is a own variation. The differences are hard to spot. But it is likely that even in a time of relocation of the whole production line Zeiss Engineers further improved or changed the body design. Maybe this was done to speed up the assembly of the body, maybe they saw a chance to make the Sonnar more robust. 

Upto almost 1200 copies might have been created but only 3 have been spotted so far. 

[v3b ZE CR abbb] 1947 Carl Zeiss Jena Contax aluminum black arrow, block pin, black mount




  • aluminum body with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm T Nr. (red T)
    • filter rim: black, rippled, 40.5 mm filter thread
    • aperture ring: big, silver, black aperture scale, long straight lines, diagonal 22 line, very small rippled grip ring, clickless
    • aperture mark: black arrow
    • grip ring: big, silver rippled
    • locking plate: small block, red painted top side
    • mount: black
  • aperture markings 2 - 22
  • single coated optics
  • v3b optical lens calculation

This is one of the first new Contax Sonnar 5cm F/2 versions from CZJ after WWII. They all use a new different design language compared to the previous wartime Sonnar lenses. They feature a new Bauhaus look, simpler, more edgy and industrial. The new lens has a an aluminum body that is even lighter than the previous wartime aluminum Sonnar lenses. The lens uses a rigid body and is not collapsible anymore. It offers a big aperture ring with a rippled grip ring and a large aperture scale. The aperture mark is now a big black arrow. This all improves the readability of the aperture setting very much. The mount of the lens is fully painted in black.

The locking pin consists of a small square. The top side of the pin is fully painted in red color. The square pin might cause issues with some adapters since it fits the Contax lock very tight.

The lens uses the same optics as the wartime Sonnar lenses. It uses the 3rd optical calculation from Ludwig Bertele, glass from Schott and Jena T coating.

After WWII the situation around CZJ was quite dramatic and chaotic. Through the events during and after the war the lens factory had lost a lot of valuable employees and at the end of 1946 the Soviet administration started the disassembly of the Jena factory to move it to the Krasnogorsk in the FSU for the planed future Jupiter-3 production. 94% of the CZJ and Schott factories were moved. To stabilize the supply of lenses until the new factory was assembled and fully running CZJ was forced to produce new batches of Contax lenses before it was completely stopped in 1951. After all it was a great feat of Zeiss Jena to create a new Sonnar version and start production in Spring 1947.

Other than one might expect most of those Contax Sonnar 5cm F/2 were mostly sold in bundle with a Contax IIa or IIIa from West German production. Catalogs of trade fairs of that time show the Jena Sonnar on the new Contax IIa or IIIa made in Stuttgart. It is rare to find this Sonnar bundled with a Kiev camera. Nevertheless the Sonnar 5cm F/2 was a desired lens for a lot of customers as it was more affordable than the F/1,5 Sonnar but still very fast. For CZJ the Sonnar F/2 was an important lens because they could produce it in way higher numbers than the Sonnar F/1,5 in the same time. Until the stop CZJ released about 15.000 Contax Sonnar F/2 copies compared with about 5.000 Sonnar F/1,5 copies.

Production started in 1947 with large batches of 600 to 1500 copies. The chaotic production of wartime continued after the war. Within those production batches different post war Contax Sonnar version were mixed without any obvious order. Exact numbers are not available so take all information with a grain of salt.

CZJ continued the previously used serial numbers system after WWII. Nevertheless 1947 production reached the serial number 3.000.001 and the first Sonnars 5cm F/2 batch of this year started with serial 3.006.201. This version was produced in multiple batches throughout the year 1947. About 2700 copies were produced. It can be found with some regularity by about 7 lenses being available every year.

[v3b ZE CR arrs] 1947 Carl Zeiss Jena Contax chrome red arrow, red dot pin, silver mount




  • chrome plated brass body, chrome finish with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm T Nr. (red T)
    • filter rim: black, rippled, 40.5 mm filter thread
    • aperture ring: big, chrome, black aperture scale, straight lines, diagonal 22 line, Germany, very small rippled grip ring, clickless
    • aperture mark: red arrow
    • grip ring: small, silver rippled
    • locking plate: triangular, red dot
    • mount: chrome
  • aperture markings 2 - 22
  • single coated optics
  • v3b optical lens calculation

This is the first all chrome post war Contax Sonnar 5cm F/2 version from CZJ. It was introduced in the first half of 1947 too. Although the overall design looks very similar to the previous versions, especially to the second aluminum one [v3b ZE CR arrb], it is more of an upgrade compared to them.

The lens body is chrome over brass. Therefore the lens is heavier than the all aluminum Sonnars but looks and feels solid and of higher quality. The other main difference is the new silver mount. The lens now looks like made from a single piece with its all chrome look.

This version is the most common one and can be found alongside the black mount aluminum lenses [v3b ZE CR arrb]. Both versions were produced side by side but the silver mount one in higher quantities. Maybe about 6.700 copies were build. Single copies show up rarely with about 20 lenses a year.

[v3b ZE CR arrb] 1948 Carl Zeiss Jena Contax aluminum red arrow, red dot pin, black mount




  • aluminum body with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm T Nr. (red T)
    • filter rim: black, rippled, 40.5 mm filter thread
    • aperture ring: big, silver, black aperture scale, straight lines, diagonal 22 line, Germany, very small rippled grip ring, clickless
    • aperture mark: red arrow
    • grip ring: small, silver rippled
    • locking plate: triangular, red dot
    • mount: black
  • aperture markings 2 - 22
  • single coated optics
  • v3b optical lens calculation

This is the second post war Contax Sonnar 5cm F/2 aluminum version from CZJ. The design of the previous version [v3b ZE CR abbb] was changed again in 1948. The color of the aperture mark was changed from black to red and the locking pin was sculpted in a rectangular shape with a red dot on top. It can only be speculated why those changes were made but the locking pin was more refined and the issues with locking some adapters seem to be solved.

Most of what it is written for the previous version [v3b ZE CR abbb] applies for this one too.

This is a very common Contax Sonnar 5cm F/2 of this period. About 4.200 copies might be produced by CZJ in one years. Over 10 lenses show up every year.

[v3b ZE CR abrb] 1948 Carl Zeiss Jena Contax aluminum black arrow, red dot pin, black mount

  • aluminum body with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm T Nr. (red T)
    • filter rim: black, rippled, 40.5 mm filter thread
    • aperture ring: big, silver, black aperture scale, straight lines, diagonal 22 line, Germany, very small rippled grip ring, clickless
    • aperture mark: black arrow
    • grip ring: small, silver rippled
    • locking plate: triangular, red dot
    • mount: black
  • aperture markings 2 - 22
  • single coated optics
  • v3b optical lens calculation

This is version of post war Contax Sonnar 5cm F/2 is a transition version. It is basically a mix of the first [v3b ZE CR abbb] and second aluminum version with black mount [v3b ZE CR arrb]. It has black arrow of the first version as aperture mark and the refined locking pin with red dot of the second version.

Most of what it is written about both versions applies for this one too. This version probably was created by accident when using up parts of both version during production. That is why this version can be considered as a transition version.

There might be only a very small number of this Sonnar lenses of about 100 copies. It shows up very rarely with only 1 lens a year.

[v3b ZE CR irrb] 1948 Carl Zeiss Jena Contax Ivory aluminum red arrow, red dot pin, black mount


  • aluminum body with ivory paint finish and Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=5cm T Nr. (red T)
    • filter rim: black, rippled, 40.5 mm filter thread
    • aperture ring: big, silver, black aperture scale, straight lines, diagonal 22 line, Germany, very small rippled grip ring, clickless
    • aperture mark: red arrow
    • grip ring: small, silver rippled
    • locking plate: triangular, red dot
    • mount: black
  • aperture markings 2 - 22
  • single coated optics
  • v3b optical lens calculation
This variation of the Sonnar 5cm f/2 stands out by its ivory paint that covers most of the lenses body. Often it is attached to a equally painted CZJ made Contax II camera (with serial 279xxx) with lizard skin. The lens is basically the same as the 2nd aluminum post-war Sonnar made by CZJ [v3b ZE CR arrb] but with ivory paint.

This lens was quite a mystery for some time. A lot of collectors thought that that those cameras and lenses were a fake or wondered about the purpose of it. There is an article inside the spring 1987 issue of the Zeiss Historica journal by Charles M. Barringer about this ivory painted camera gear. He writes that this variation was an attempt by CZJ "to see whether or not the market would accept cameras in other than chrome and black". Even a red finished camera is mentioned and images of ivory painted Sonnar 13,5cm f4, 18cm f/2,8 and 30cm f/4 are shown in this article. Those ivory painted Sonnar lenses can be considered as Zeiss Jena prototype lenses. It can only be speculated but the disassembly of the whole Contax production line in Jena, that started in 1946, stopped any further try outs and prevented that any results went into mass production.

Only a very small number of those ivory painted lenses and cameras are known today and they are very expensive collectors items.

[v3b ZE CR arrb0] 1950 Carl Zeiss Jena Contax aluminum red arrow, red dot pin, black mount 50mm




  • aluminum body with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=50mm T Nr. (red T)
    • filter rim: black, rippled, 40.5 mm filter thread
    • aperture ring: big, silver, black aperture scale, straight lines, diagonal 22 line, Germany, very small rippled grip ring, clickless
    • aperture mark: red arrow
    • grip ring: small, silver rippled
    • locking plate: triangular, red dot
    • mount: black
  • aperture markings 2 - 22
  • single coated optics
  • v3b optical lens calculation
This late version is basically the same as the 2nd aluminum version with black mount [v3b ZE CR arrb]. The key difference is use of the more modern naming scheme with the focal length in mm instead of cm. The name reads now Sonnar 1:2 f=50mm T instead of 5cm.

This is a bit of a rare lens. About 700 copies were made of this version but only 2-3 show up every year.

The production (of all Contax Sonnar lenses) ended in Spring 1951. In this year the production of Sonnar 50mm F/1.5 and F/2 T started by Opton-Zeiss in West Germany. The Production of Jupiter-8 5cm F/2 P lenses had already started in 1950 in Krasnogorsk. It is speculated that the Soviet administration forced CZJ to stop the production after the Soviet production had been stabilized.

[v3b ZE CR arrs0] 1950 Carl Zeiss Jena Contax chrome red arrow, red dot pin, silver mount 50mm




  • chrome plated brass body, chrome finish with Contax Rangefinder mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=50mm T Nr. (red T)
    • filter rim: black, rippled, 40.5 mm filter thread
    • aperture ring: big, chrome, black aperture scale, straight lines, diagonal 22 line, Germany, very small rippled grip ring, clickless
    • aperture mark: red arrow
    • grip ring: small, silver rippled
    • locking plate: triangular, red dot
    • mount: chrome
  • aperture markings 2 - 22
  • single coated optics
  • v3b optical lens calculation
This late version is basically the same as the first all chrome version [v3b ZE CR arrs]. The key difference is use of the more modern naming scheme with the focal length in mm instead of cm. The name reads now Sonnar 1:2 f=50mm T instead of 5cm.

This is a bit of a rare lens. About 700 copies were made of this version but only 1-2 show up every year.

The production (of all Contax Sonnar lenses) ended in Spring 1951. In this year the production of Sonnar 50mm F/1.5 and F/2 T started by Opton-Zeiss in West Germany. The Production of Jupiter-8 5cm F/2 P lenses had already started in 1950 in Krasnogorsk. It is speculated that the Soviet administration forced CZJ to stop the production after the Soviet production had been stabilized.

[v3b ZE KF b] 1952 Carl Zeiss Jena KEF










source:  Zeiss Archiv
  • all black finish with KEF mount
    • name ring: Carl Zeiss Jena Sonnar 1:2 f=50mm T Nr., Carl Zeiss Jena Sonnar 2/50 T 1Q
    • filter rim: black, smooth
    • aperture mark: red arrow
    • aperture ring: black, white dots, small grip rippled grip ring, clickless
    • mount: black, threaded, M33.5x0.5
  • aperture markings (2 - 22) dot marks without letters
  • single coated optics
  • v3b optical lens calculation

From 1952 to 1954 CZJ produced the first cine version of the Sonnar 5cm F/2 for the KEF mount. KEF stands for Kino-Einbaufassung (cinema build in mount). This is not a standardized mount and no proprietary one. This version of the Sonnar was intended to be customized by movie makers to fit their needs and cameras. Today and in the past motion picture camera users rehoused existing lenses to improve the handling or just to add a specific lens for another mount to a desired cine mount. To help in adapting and customizing their lenses for motion picture cameras CZJ created KEF versions of multiple lenses like the Biotar 1,5/75, 2/25, 2/35, 2/40, 2/58 or the Sonnar 1,5/50, 2/50, 2/85, 2,8/180, 4/135, 4/300. CZJ itself claimed that they tried to build the KEF versions as lightweight and small as possible without sacrificing quality or functionality.

The KEF version of the Sonnar 2/50 comes in an all black body with white letters. There is an aperture ring with markings but without numbers. So the user has the freedom to use the lens as it is or add inscriptions, disassemble the lens or add grips, hoods or scales to the lens body and customize it. The only mounting help is provided by a standardized M33.5x0.5 screw mount. The body can be disassembled by unscrewing an outer shell that gives access to another M33x0.5 screw mount. And even a removable ring that covers the M33.5x0.5 thread can be used to tighten and secure mount adapters.

The name scheme used at (later) lenses name rings shows a more modern inscription. The focal length and maximum aperture is abbreviated to 2/50. The red T for coated lenses is dropped (although the lens is coated). The new quality symbol 1Q was added too (later). It stands for Erste Qualität (first quality) and shows build quality suitable for world wide sales. It was meant to be sold on the international market to earn urgently needed western money. Nevertheless a lot of the KEF Sonnars might be used by the East German DEFA creating motion pictures.

About 500 lenses were created. Only 6 were found yet.

[v3b ZE KF bY] 1952 Carl Zeiss Jena KEF 551702




  • all black finish with M33x0.5 thread
    • name ring: Carl Zeiss Jena Sonnar 2/50 1Q
    • filter rim: black, smooth
    • aperture mark: missing
    • aperture ring: missing, clickless
    • mount: black, threaded, M33x0.5
  • aperture markings (2 - 22)
  • single coated optics
  • v3b optical lens calculation
This is last Sonnar 5cm F/2 made by Carl Zeiss Jena. It was only produced in a single production run of 100 lenses in 1959.

The body strongly reminds of the KEF variation [v3b ZE KF b]. It shares the same all black body and paint. The key differences are that it is missing all aperture markings and the aperture ring is missing completely. Instead it has a small aperture lever without marks that helps changing the aperture of the lens. Another difference is that it lacks the thread right beneath the filter rim. While the first KEF variation needs this thread to attach the aperture ring it seems this was not needed for this variation.

The only screw thread that can be used as a mount has a different measure than the thread found on the KEF variation [v3b ZE KF b]. It is M33x0.5. But this thread fits the outer shell of the previous KEF variations body. 

The purpose of this Sonnar 50mm F/2 is unclear. There are no details about this Sonnar left other than a model number 551702. But it is very likely that this Sonnar was intended to replace the previous KEF version. This lens is as bare as possible for a Sonnar 2/50. It is very small and the lightest variation of all. To mount it to another motion picture camera one needs to provide a custom aperture ring and scale additionally to a focus mechanism and camera mount. There is no adapter known yet.

As previously stated there are only 100 copies of this lens. It is very rare and only 6 are known.

[v4b ZO CR sot2] 1950 Zeiss-Opton Contax silver rim T 12 aperture blades






  • chrome over brass body, chrome finish with Contax Rangefinder mount
    • name ring: Zeiss-Opton Sonnar 1:2 f=50mm T Nr(red T)
    • filter rim: chrome, 40.5 mm filter thread, smooth
    • aperture ring: big, chrome, 2 scales, black aperture scale, straight lines, very small rippled grip ring, clickless
    • aperture mark: black arrow over grip ring
    • grip ring: chrome rippled
    • locking plate: small red rectangle at tip
    • mount: chrome, (Made in Germany)
  • aperture markings 2 - 22
  • single coated optics
  • v4b optical lens calculation

This is the first Contax Rangefinder Sonnar 50mm F/2 version that was produced in Oberkochen (Coburg first) in West Germany. In February 1949 the Carl Zeiss Foundation was moved from Jena to Heidenheim. With this step the Optische Werke Oberkochen became the head of Carl Zeiss. After the move development and production of new lenses started in Oberkochen. This step was justified by the Carl Zeiss management through the disassembly of the plant in Jena by the Soviet administration that started in spring 1946. The Sonnar production in Jena was moved to Krasnogorsk in the FSU. Carl Zeiss started a new Contax camera production in Stuttgart (West Germany) and to fit their new designed Contax IIa and IIIa with lenses they decided to start lens development and production in Oberkochen knowing that Jena was not able to deliver those lenses for the Contax anymore.

This was done in the light of new competition from Japan and the FSU that offered their own Contax and Sonnar copies to customers. Carl Zeiss tried to win this battle and reestablish the own brand over the East German branch in Jena with an improved Contax camera and lens lineup that offers the highest professional quality to customers all over the world.

This Sonnar 50mm F/2 T is a complete redesign trying to improve on all aspects over the wartime Jena Sonnar and introduce modern features. The body design of the new Zeiss-Opton lens strongly resembles the Zeiss-Opton Sonar 50mm F/1,5 T where the production started before the F/2 production. It has a similar design like the CZJ 1947 silver mount Sonnar design [v3b ZE CR arrs] too though it tried to improve on it in multiple ways. The name ring uses a different naming scheme. It clearly states Zeiss-Opton instead of Carl Zeiss Jena and it uses a modern focal length notation in mm instead of cm. The lens is chrome over brass with a chrome filter ring. It is quite heavy and has a solid feel to it. This heavy chrome exterior oozes build quality.

For the first time the aperture ring shows a linear scale. This means that the distance between all stops on the scale is equally the same. In the past the scale was exponential so the distances between stops differed from wide and narrow aperture settings. The new aperture scale made setting up narrow apertures easier. Another improvement was the introduction of a doubled scale. The aperture scale now is shown on 2 sides of the lens and there are two black arrows as aperture mark. Since the complete lens turns during focusing the aperture scale is moving with it and in and out of the view of the photographer. By putting a scale and marker on both sides of the lens body one scale should be easily visible before and after focusing. Those changes might seem simple but they improved the handling of the lens in a nice way.

ZO added a new designed aperture. The new 12 bladed aperture is not circular anymore. The new mechanism is a complex (and beautiful) design that creates star like apertures and is an attempt to reduce the focus shift effect by blocking unwanted light stopped down.

This Sonnar uses a new optical calculation with unknown origin. Although not stated anywhere officially this 4th optical design was created by the father of the Sonnar lens Ludwig Bertele again. The high pressure to succeed over the new competition from Japan and the FSU drove ZO to hire their ex-employee Bertele. He used new available Lanthan glass and improved coatings to do a recalculated of the existing Sonnar design and improve this design further. The lens got the new T coating of ZO. That is shown by the red T on the name ring. The result was an improvement in contrast and central sharpness.

The new 4th optical formula is not compatible with other pre-war or wartime Sonnar lenses. For example it is not possible to easily swap a pre-war lens block into an Opton Sonnar lens body. It simply will not fit. This might be a design goal of Zeiss West here to fight black market piracy. The new lens parts can hardly be mixed with parts from other Sonnar or Jupiter lenses. It worked. There exists almost no "fakes" of Opton Sonnar lenses.

One further important detail needs to be explained. Zeiss Oberkochen decided to start their own serial number counting. The used serial numbers don't start from 3.000.000 but from 1.000 again. The first ZO Sonnar 50mm F/2 batch started with the serial 58.781. This restarted numbering might cause some confusion and even overlapping serial number blocks with serial numbers used by CZJ.

ZO produced about 10.000 copies of this new Sonnar version from 1950 to 1951. Copies are quite common with about 20 copies showing up each year.

[v4b ZO CR sot1] 1952 Zeiss-Opton Contax silver rim T 11 aperture blades






  • chrome over brass body, chrome finish with Contax Rangefinder mount
    • name ring: Zeiss-Opton Sonnar 1:2 f=50mm T Nr(red T)
    • filter rim: chrome, 40.5 mm filter thread, smooth
    • aperture ring: big, chrome, 2 scales, black aperture scale, straight lines, very small rippled grip ring, clickless
    • aperture mark: black arrow over grip ring
    • grip ring: chrome rippled
    • locking plate: small red rectangle at tip
    • mount: chrome, (Made in Germany)
  • aperture markings 2 - 22
  • single coated optics
  • v4b optical lens calculation

This is the second Contax ZO version of the Sonnar 50mm F/2 T. It differs only in one detail from the first version [v4b ZO CR sot2]. The aperture was changed to 11 blades instead of 12 blades. It uses the same star aperture mechanism.

This is a pretty common lens. ZO produced 4.000 copies from 1952 to 1953. About 8 lenses show up every year.

[v4b ZO CR bot] 1952 Zeiss-Opton Contax black rim T 11 aperture blades




  • chrome over brass body, chrome finish with Contax Rangefinder mount
    • name ring: Zeiss-Opton Sonnar 1:2 f=50mm T Nr(red T)
    • filter rim: black, 40.5 mm filter thread, smooth
    • aperture ring: big, chrome, 2 scales, black aperture scale, straight lines, very small rippled grip ring, clickless
    • aperture mark: black arrow over grip ring
    • grip ring: chrome rippled
    • locking plate: small red rectangle at tip
    • mount: chrome, (Made in Germany)
  • aperture markings 2 - 22
  • single coated optics
  • v4b optical lens calculation

This is the third Contax ZO version of the Sonnar 50mm F/2 T. It differs only in one detail from the previous version [v4b ZO CR sot1]. It has a black filter rim.

This is a pretty common lens. ZO produced 12.000 copies from 1952 to 1953. About 15 lenses show up every year.

[v4b ZO CR bo] 1953 Zeiss-Opton Contax black rim




  • chrome over brass body, chrome finish with Contax Rangefinder mount
    • name ring: Zeiss-Opton Sonnar 1:2 f=50mm Nr
    • filter rim: black, 40.5 mm filter thread, smooth
    • aperture ring: big, chrome, 2 scales, black aperture scale, straight lines, very small rippled grip ring, clickless
    • aperture mark: black arrow over grip ring
    • grip ring: chrome rippled
    • locking plate: small red rectangle at tip
    • mount: chrome, (Made in Germany)
  • aperture markings 2 - 22
  • single coated optics
  • v4b optical lens calculation

This is the 4th version of the Contax Sonnar 50mm F/2 and is the almost the same as the previous version [v4b ZO CR bot]. The only difference is the engraving on the name ring. The name ring is missing the red T mark. Since 1954 all Zeiss lenses get the Zeiss T anti reflection coating and so Zeiss decided to stop engraving the T mark at the name ring on all lenses. In the middle of the 1970ies Zeiss (West) introduced multi coating and started to engrave lens rings with a red T* again.

This lens is not as common as the other Contax versions. About 2.000 copies were made in 1954. Nevertheless about 2 lenses show up each year.

[v4b ZO CR bz] 1954 Carl Zeiss Contax black rim




  • chrome over brass body, chrome finish with Contax Rangefinder mount
    • name ring: Carl Zeiss Sonnar 1:2 f=50mm Nr
    • filter rim: black, 40.5 mm filter thread, smooth
    • aperture ring: big, chrome, 2 scales, black aperture scale, straight lines, very small rippled grip ring, clickless
    • aperture mark: black arrow over grip ring
    • grip ring: chrome rippled
    • locking plate: small red rectangle at tip
    • mount: chrome, (Made in Germany)
  • aperture markings 2 - 22
  • single coated optics
  • v4b optical lens calculation

This is the 5th and last Contax Sonnar 50mm F/2 from ZO. It introduces the new company name Carl Zeiss on the name ring. In 1954 ZO won the court trial about the usage of the name Carl Zeiss. As a result the name Zeiss-Opton was dropped and Carl Zeiss was used instead. This is the only visible difference between this and the previous version [v4b ZO CR bo].

This is a very common West German Sonnar 50mm lens. About 11.000 copies were manufactured until 1957. This one is easy to find with about 30 copies showing up every year.

Starting in the serial 1.257 million range there is a noticeable tendency for Zeiss Sonnars to show balsam separation. It is widely argued that Zeiss changed the glue at some point and the new glue is not as long-lasting as the previous one. Zeiss probably changed from Canada balsam to an new UV-hardening glue for easier and faster cementing of lens groups. 

[v4b ZO RR b] 1955 Carl Zeiss Robot Royal black rim




  • heavy chrome over brass body, chrome finish with Robot Royal mount
    • name ring: Carl Zeiss Sonnar 1:2 f=50mm Nr, steep narrow
    • filter rim: black, 38 mm filter thread, smooth
    • aperture ring: chrome, 1 scale, colored aperture scale (yellow, red, green, black), very small rippled grip ring, with full stop clicks, ROBOT Germany
    • DOF scale: chrome, colored dots (yellow, red, green, black) with lines, middle mark with black diamond symbol
    • focus ring: chrome, colored distance dots (yellow, red, green, black), small m, 0,75 - 20, small rippled grip ring, 3 rounded focus tabs
    • mount: chrome, 2 red dots
  • aperture markings 2 - 22
  • single coated optics
  • v4b optical lens calculation
This Sonnar 50mm f/2 is the only variation made for the Robot Royal 36 camera. The Robot cameras were build by the Otto Berning / Robot firm. The Robot Royal 36 was released at the end of 1955, used 35mm film ( 24x36mm format ), offered a coupled rangefinder, exposure times between 1/2s and 1/500s (with flash) and 5 to 8 exposures per second. Although the same size as a Leica 3 the camera is build like a tank and weight 1 kg.

This Robot Sonnar 50mm f/2 offers a Robot Royal mount. It is the heaviest Sonnar 50mm f2 variation with over 270 gram weight. It uses a chrome finish and a colored aperture scale and distance dots. The focus scale shows that it could be focused as close as 0.75 m compared to 1 m of the Contax lenses. It offers full stop clicks as first to the line.

The lens uses an unusual filter size of 38mm, not the usual 42,5mm size. This filter size comes with a new designed very step name ring. 

The RoBot 36 cheats a little bit and the negative image width is closer to 35mm than the actual 36mm specified. Probably they could not stretch it that far from the 24x24mm model, which was the base for the Robot Royal 36 camera.

This Sonnar was mainly produced in 2 big batches until the end of the 1950ies. It can be estimated that over 5000 Robot Sonnar 50mm f/2 were made in that time. Copies show up regularly for about 8-10 times a year. Most of the time Sonnars come paired with a Robot Royal 36 camera and sell for a high price.

[v4b ZO CR bzR] 1955 Carl Zeiss Contax black rim Robot head






  • chrome over brass body, chrome finish with Contax Rangefinder mount
    • name ring: Carl Zeiss Sonnar 1:2 f=50mm Nr, steep narrow
    • filter rim: black, 40.5 mm filter thread, smooth
    • aperture ring: big, chrome, 2 scales, black aperture scale, straight lines, very small rippled grip ring, clickless
    • aperture mark: black arrow over grip ring
    • grip ring: chrome rippled
    • locking plate: small red rectangle at tip
    • mount: chrome, (Made in Germany)
  • aperture markings 2 - 22
  • single coated optics
  • v4b optical lens calculation
This is the last Contax Sonnar 50mm F/2 from ZO. It features the Carl Zeiss name and a new name ring portion that is more steep and recessed. This name ring portion is the same as the one found on the Robot Royal mount version [v4b ZO RR b]. ZO used the Robot Royal lens parts within the Contax lens production of this [v4b ZO CR bz] variation. 

This is a common West German Sonnar 50mm lens. About 5.000 copies were manufactured until 1958. About 10 copies show up every year.

This version is the very last Contax Sonnar version of Carl Zeiss. Zeiss dropped the whole Contax system in 1959. Carl Zeiss never produced another Sonnar 50mm F/2 or F/1,8.

Sonnar lenses from other companies

1947-1959 Jupiter-8 1:2 F=5CM P Contax

Sovietcams.com has created an overview over all Contax RF Jupiter-3 versions. It is very detailed and with a lot more insight than this article. The following description is only a rough overview over some of the Jupiter-8 versions. The Contax Jupiter-8 lenses where produced by different manufacturers in the FSU: 1947-1954 KMZ (Krasnogorski Mekhanicheskii Zavod), 1954-1981 Arsenal Factory. 

The name on the lens changed over time: 1947-1950 ZK, 1950-1958 Jupiter-8, 1959-1981 Jupiter-8M.
[v3b ZK CR ZK] 1948 KMZ ZK P Contax



  • aluminum body with flat head and with Contax Rangefinder mount (PT3515 body)
    • name ring: (1948) (ZORKII) ZK 1:2 F=5CM P N (red P), flat
    • filter rim: silver, rippled, 40.5 mm filter thread
    • aperture ring: small, silver, black aperture scale on separate, screwed on, ring with 2 small finger grips, clickless
    • aperture mark: big black arrow inside gap in grip ring
    • grip ring: big, chrome rippled
    • locking plate: red painted top side
    • mount: silver, horizontal cut
  • aperture markings 2 - 22
  • single coated optics
  • v3b lens calculation
[v3k AF CR j8mbr0] 1974 ARSENAL Jupiter-8M Contax




  • chrome finish body with black filter rim and with Contax Rangefinder mount
    • name ring: JIOPITER-8M 2/50, flat
    • filter rim: black, rippled, 40.5 mm filter thread
    • aperture ring: small, chrome, 2 black aperture scales, no lines, full stop clicks
    • aperture mark: red dot above grip ring
    • grip ring: big, chrome rippled
    • locking plate: square with red painted front side
    • mount: chrome
  • aperture markings 2 - 22
  • single coated optics
  • v4k optical lens recalculation
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Comments

  1. pos13/3/25 23:55

    Hello just purchased a Sonnar 50 F2 T with LTM39. Serial 2686221. Performance is excellent

    ReplyDelete

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