(multi-coated)

OM-1 with mirror lockup; 9 condition sample

Vignetting = C+ @ f/2, A- @ f/2,8
Distortion = moderate barrel
Aperture Center Corner
f/2      B      B
f/2.8    A      B+
f/4      A+     A-
f/5.6    A      A
f/8      A      A-
f/11     A-     B+
f/16     B+     B+
Notes: Remarkable contrast at larger apertures, high resolution at expense of contrast stopped down, with moderately low to moderate contrast by f/16. Remarkable performance at f/4. One of the sharpest Zuiko lenses.

OM-2000 with mirror and aperture prefire
Aperture Center Corner
f/2      B      B-
f/2.8    A-     B
f/4      A      A-
f/5.6    A      A
f/8      A      A+
f/11     A      A
f/16     A      A
Notes: This sample was a 7+ grade condition. Moderate contrast at f/8 to f/16, moderately high contrast at f/5.6 and f/4.