kzphoto
Well-known
So I thought it prudent to make a list of lenses that have been tried and verified OK on the GXR-M mount.
21mm f/4.5 Zeiss Biogon-C (still working on good corner fixes)
28mm f/2.8 Konica Hexanon-M (May not need any fixes, most corners look fine.)
50mm f/2.4 Konica Hexanon LTM (no fixes needed, fits inside GXR-M mount completely collapsed)
90mm f/2.8 Konica Hexanon-M (No issues)
Feel free to contribute to the list if you have a lenses that are not listed.
21mm f/4.5 Zeiss Biogon-C (still working on good corner fixes)
28mm f/2.8 Konica Hexanon-M (May not need any fixes, most corners look fine.)
50mm f/2.4 Konica Hexanon LTM (no fixes needed, fits inside GXR-M mount completely collapsed)
90mm f/2.8 Konica Hexanon-M (No issues)
Feel free to contribute to the list if you have a lenses that are not listed.
johannielscom
Snorting silver salts
Not much of a list yet.
Anyone that can tell me anything about the compatibility of the Super-Angulon 3.4/21 on the GXR-M module?
Anyone that can tell me anything about the compatibility of the Super-Angulon 3.4/21 on the GXR-M module?
Kent
Finally at home...
It's interesting to see that even the "specialized for M" Ricoh set-up has - when shooting wide angles - problems with the corners that need to be fixed.
Everybody was yelling at the NEX-7 (which is not especially designed for M-lenses anyway).
Everybody was yelling at the NEX-7 (which is not especially designed for M-lenses anyway).
Tom Diaz
Well-known
My 'specialized for M' Leica M9 also has corners that need to be fixed, with some lenses. The M9 uses the 6-bit coding to apply the fixes automatically. The Ricoh does not employ any kind of coding, so we owners have to figure them out and dial them in.
Reviewers seem to agree with my own experience (limited so far), that the GXR does a better job with M lenses than my m4/3 cameras and better than the Nexes. That does not mean it is better in every way, of course. The Nexes, with good lenses, are great!
Tom
Tom Diaz
Well-known
aleksanderpolo
Established
I don't understand why there is need for cornerfix? The widest I have is the CV 15, I just need to have +3 peripheral illumination to counter the vignetting, no color shift that I can see in raw or jpg afterwards. Have you tried it with the C-Biogon and does NEX offer similar function?
Tom Diaz
Well-known
Thanks for the information about the CV15. It looks like my CV12 also needs a peripheral illumination correction, but I haven't determined which setting.
I think people have mentioned cornerfix because, according to the Ricoh manual, at least one of the in-camera corrections (distortion) is not applied to raw images, just to jpgs. I don't know--are peripheral illumination and color shading corrections also limited to jpgs? The manual is ambiguous.
Tom
aleksanderpolo
Established
The peripheral illumination is applied to raw and jpg, I tried the color shading once and it doesn't seem to do anything to the image except changing the color shade of the LCD. I could be mistaken though, but I cannot see any color shift after peripheral illumination so I think the color shading correction is not needed anyway. I never apply any other distortion correction and leave it as is, as it is part of the "character" of the lens. 
Someone mentioned that the CV12 need +2 or +3 peripheral illumination? you can probably try it and see if this is adequate.
Someone mentioned that the CV12 need +2 or +3 peripheral illumination? you can probably try it and see if this is adequate.