Canon FD 35mm f/3.5 pre-S.C. breech mount
Canon F-1 with mirror and diaphragm prefire

Vignetting = ? @ f/3.5, A- @ f/5.6, A thereafter
Distortion = slight barrel

Aperture Center Corner
f/3.5    B+?    B-?
f/5.6    B+     B
f/8      B+     B+
f/11     B      A-
f/16     B      B

Note:
provisional SQF grades at f/3.5 due to overexposure;
moderately high contrast at f/5.6;
high contrast at f/8 through f/16.
Moderate contrast at f/3.5 and f/22;
moderately high contrast at f/5.6 through f/16.