Previous versions of Steve Spencer's message #16894411 « A comparison of the Voitlander lenses (50 f/1.2 for Fuji X mount with 50 f/1.2 for Sony E mount cropped and 75 f/1.5 for Leica M »
It has 9 elements in 8 groups and 2 APD elements but no Asph elements. It is a pretty classic sonnar design.
It is a quite different design than the 50 f/1.2 for full frame mounts (Cosina makes that lens for Leica M, and Sony E mounts). I am using the Sony E mount version. I have had this lens for years, but recently got the SE version which is lighter and cannot be declicked for video and that is what I am using. I like the lens a lot, and have enjoyed using it on Sony. This lens has 8 element in 6 groups with 2 aspherical elements and 1 APD elements. It is not really a sonnar design and closer to a double gauss but it looks to me a bit like the Leica M 50 f/1.4 Asph as well. It is bigger lens. I will be comparing it to the Fuji shooting it in APS-C crop mode on Sony. You can see the specifics on it at the Cosina website here:
Since these lenses are going to be shot on an APS-C camera and a FF camera in crop mode I want to compare them to a somewhat similar lens on FF Sony. I have the Voigtlander 75 f/1.5 in Leica M mount which has the same field of view on FF as these 50 f/1.2 lenses shot on APS-C. The 75 f/1.5 bit bigger entrance pupil and therefore can create shallower depth of field (DOF) wide open, but only by about half a stop. I will compare the lenses wide open and that with as similar of entrance pupils/DOF as I can. I will compare at f/1.2 vs. f/1.5; f/1.4 vs. f/2; f/2 vs. f/2.8; and f/2.8 vs. f/4. This lens has 7 elements in 6 groups with 1 aspherical element and 3 APD elements. It is to my eye mostly a sonnar design, but perhaps less so of one than the 50 f/1.2 for Fuji X mount. I shot this lens with the TTartisans coded Leica M to Sony E mount adapter set to 75mm so I should have gotten IBIS with the correct focal length set. You can see the specifics on it at the Cosina website here:
Here are the measured weights of the lens bare without any caps or hoods and a picture of the lenses so you can see the size comparison better.
Voigtlander 50 f/1.2 for Fuji X mount (CVX 50): 287g
Voigtlander 50 f/1.2 SE for Sony E mount (CVE 50): 382g
Voigtlander 75 f/1.5 for Leica M with TT artisans adapter (CVM 75): 379g
When I shot these I used the Voigtlander specified hood for the CVX 50 and CVM 75, and on the CVE 50 I used the hood for the CVX.
Sep 21, 2025 at 07:47 AM
Previous versions of Steve Spencer's message #16894411 « A comparison of the Voitlander lenses (50 f/1.2 for Fuji X mount with 50 f/1.2 for Sony E mount cropped and 75 f/1.5 for Leica M »
