Interesting... Yoshiihiko tests using T-max,
The FA 50 macro test as a pretty much flat line from 4 to ƒ22 taking off at ƒ22,
The DFA 50 macro 2.8 OpticalLimits (Photozone) is nowhere near flat.
Is this a film vs Digital issue?
I wonder if it's possible to compare these metric by dividing lw/ph by 24mm.
At ƒ4 the Yoshiihiko has the lens at 98
Klaus has it at 2668/17mm= 156 lines per mm
At ƒ22 the Yoshiihiko has the lens at 98
Klaus has it at 1733/17mm= 101
Just one of those things I guess. Does Imatest test differently than whatever they used for film?
Different lenses, different testers, unknown method, discrepancies between testers suing the same lenses and software.... it's a crap shoot.
Perhaps about 110 line/mm is the most the film could resolve. That would explain the flat line on film, but much higher resolutions on digital. It doesn't matter what the lens resolves, the film can't get past 110. Where as the 16 MP sensor is resolving 152 lines/mm and shows more of a curve... just a guess.
Last edited by normhead; 03-14-2018 at 08:46 AM.