Leitz 90mm f/2.0 APO-Summicron-M
Leica M4-P with cable release
Vignetting = none
Distortion = none
Aperture Center Corner
f/2*     B      C+
f/2      B      C+
f/2.8    B+     B-
f/4      A-     B
f/5.6    A+     B
f/8      A-     B
f/11     A-     A-
f/16     B+     B
Notes: * = with a B+W filter. High contrast images at f/2 to f/2.8; very high contrast images at all other apertures.