phinix
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1bwana1 wrote:
Yeah, even with the corrections applied the problems persist to a level that I would find unacceptable. Please note that this doesn't say anything about whether or not you have a good copy of the lens.
The next step would be to try and do some manual corrections. However, I doubt you or anyone would want to put that much work into images shot with this lens on that body.
This is exactly why I have stopped adapting M mount lenses to unmodified Sony cameras.
In order to acheive the high levels of performance with small lenses that leica is famous for, Leica treats the lenses and the camera as a system. These small diameter lenses with full frame coverage require that the further from center of the sensor, the higher the angle of incidence the light direction must be. The widder the focal length, the greater this problem gets. Leica designs their sensors to cpmpensate for this with famously amazing results. The glass cover is thin, and is composed of microlenses that are designed so that as you move away from center, they are no longer symetrical, but curved to optomize for this high angle of incidence. The Sony sensor glass layer is thicker, and has symetrical microlenses that cannot compensate for this high angle of incidence. This results in the chromatic aberations, distortions, and smearing, that we are seeing here.
The small M mount Voigtlander lenses also have this design. The result is that you need to either buy the E-Mount version of the lenses, or send your camera to a place like Kolari Vision to have the sensor glass replaced by a thinner version. In my opinion the reults are still not as good as a native M mount lens on a Leica sensor.
This is all just simple physics and won't change no matter how good a copy of the lens you get. So changing it out will not solve your issues.
I have both the M mount and the E-Mount versions of this lens. I have included a picture below. You can see that although they are both "Voigtlander 21mm f/3.5 Color Skopar" lenses they are very different in size and design. This for very good reasons.
I hope you find this information educational and usefull.
Steve...Show more →
Thank you for your reply, it is very informative.
I thought that I could buy this VM lens for Sony camera, cause it was so small, nice to handle, short focus throw etc
I had many E mount Voigtlanders and did not like the size and weight. However, I had 35mm 1.4 which is almost the same as E mount 21mm and liked the size - for me it was maximum I could use on A7C.
So you are saying that E mount has no issues at all and all corrections are applied on camera? How is focus throw? is it short, like 90-100 degrees like VM, or freaking long, like CV40mm 1.2 E mount has?
I bought this VM cause saw many people, including Fred here, confirming that VM is great on Sony and there are no issues.
To be honest, I don't really see that CA when looking at photo on a screen, without magnifying. Would you say that VM would make photos a lot worse on Sony? Like definitely you wouldn't recommend it and get E mount instead?
Do you have other Voigtlander VM lens you use? I guess if you have, you use them on your modified Sony body?
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