PhilippePASCAL wrote:
Very nice discovery !
I'm on M43 sensors Olympus for years.
Those sensors have a lot of problems with adapted 35 film :
-heavy crop : you loose a LOT of lines, even if you get the best "center" ones
-4mm filter stack : we know since Kolarivision and LensRental article filter stack create troubles with fast/wide film lenses...and M43 ones are (sadly) the thickest ones.
So astigmatism and spherical aberrations are "enhanced" by sharpness lost (crop) and 4mm filter stack.
Can someone give me some "hints" to try a fix on an usual lens ?
My main candidates are, for now, Canon FDn 50mm f1.4 and Helios 44-2.
I really want to try this, because the only other solution i found was focal reducer (Lens turbo II for me). It works, but less than on any APS-C sensor (less crop, less filter stack...).
Thanks !
Thank you for the comment!
I did some simulation considering 50mm lens + M43 sensor (4mm filter stack), but unfortunately couldn't find optimal PCX for this combination
Your concern is true. In the simulation, I also see some astigmatism and spherical aberrations caused by the 4mm filter stack.
Then I simulated 1~10m PCX put in front of the 50mm lens. Astigmatism is improved but field curvature gets worse and spherical aberrations are not changed by the PCX. Overall IQ (MTF) is not improved by any of those PCX at least in theory.
