Leitz 100mm Macro Elmar
Olympus OM-4T wth Auto Bellows, mirror and diaphragm prefire*
Vignetting = A @ f/4 and thereafter
Distortion = slight pincushion
Aperture Center Corner
f/4      B-     B-
f/5.6    B+     B-
f/8      A-     B+
f/11     B      B
f/16     B      B
f/22     B-     B-
Notes: * this lens was modified for mounting on the Olympus OM System Auto Bellows, albeit with a manual diaphragm. Moderately high contrast images at f/4 to f/5.6 and f/16 to f/22; high contrast images at f/11.