Have done some further testing and the problem was due to my adaptor being too thin after the modification which explains a lot - after shimming it so that the Zeiss reached infinity at the right point it is perfect again
Have been doing a few further tests with SLR lenses after the modification and there is a small detectable change with regards to field curvature with some lenses and no change with others - not sure why though as the exit pupil distance argument may not stand up here.
For example the Zeiss 21/2.8 ZF.2 has always performed flawlessly after f5.6. On the modified Sony field curvature seems to be an issue now. I managed to find an old test image with this lens before the conversion and was very surprised at the difference. The Olympus 24/2.8 however behaves just as it used to and the Contax Zeiss 28/2.8 has actually improved.
Have included a reference image with the Voigtlander 21/1.8 which at f4 now is even sharper than the Zeiss ever was so I am not complaining :-) :-)
Despite this rather unexpected behaviour with some SLR lenses the Kolarivision modification was absolutely worth it - I have started enjoying using the camera again and using Leica M lenses with it makes all the difference.
Re: A thinner sensor stack may be possible after all!
Have been doing a few further tests with SLR lenses after the modification and there is a small detectable change with regards to field curvature with some lenses and no change with others - not sure why though as the exit pupil distance argument may not stand up here.
For example the Zeiss 21/2.8 ZF.2 has always performed flawlessly after f5.6. On the modified Sony field curvature seems to be an issue now. I managed to find an old test image with this lens before the conversion and was very surprised at the difference. The Olympus 24/2.8 however behaves just as it used to and the Contax Zeiss 28/2.8 has actually improved.
Have included a reference image with the Voigtlander 21/1.8 which at f4 now is even sharper than the Zeiss ever was so I am not complaining :-) :-)
Despite this rather unexpected behaviour with some SLR lenses the Kolarivision modification was absolutely worth it - I have started enjoying using the camera again and using Leica M lenses with it makes all the difference.
Mar 14, 2015 at 07:59 AM
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