(multi-coated) 
best SQF grade from two tests of the same lens (see Notes); 
OM-1 with mirror lockup Vignetting = none Distortion = none 
Aperture  Center    Corner 
f/6.5     C+        C+ 
f/8       D         D+ 
f/11      C         C 
f/16      C+        C+ 
f/22      B         B 
f/32      A-        B+ 

Notes: Moderately high contrast but lack of resolution, despite use of 2 tripods for stability in first test and a lens support in the second test. Drop in SQF grade upon stopping down probably due to harmonic vibration induced by the auto diaphram mechanism in the OM-1.