Canon FD 80-200mm f/4 bayonet mount
Canon EF with mirror and diaphragm prefire

@ 80mm setting
Vignetting = B+ @ f/4, A- @ f/5.6, A thereafter
Distortion = barrel

Aperture Center Corner
f/4      B      B-
f/5.6    B      B
f/8      B+     B+
f/11     B+     B+
f/16     A-     B+
f/22     B      B
f/32     B      B-

Notes:
moderate contrast at f/4;
moderately high at f/5.6, f/22 and f/32;
high contrast at f/8 through f/16.

@ 135mm setting
Vignetting = B @ f/4, A- @ f/5.6, A thereafter
Distortion = none

Aperture Center Corner
f/4      B-     C+
f/5.6    B      B-
f/8      B      B
f/11     A-     B+
f/16     B+     B
f/22     B      B-
f/32     B-     C

Notes:
moderately high contrast at all apertures except f/32,
where moderate contrast.

@ 200mm setting
Vignetting = A- @ f/4, A thereafter
Distortion = moderate pincushion

Aperture Center Corner
f/4      B-     B-
f/5.6    B      B
f/8      B+     B
f/11     B+     B
f/16     B+     B
f/22     B      B-
f/32     B-     B-

Notes:
moderately low contrast at f/4;
moderately at f/5.6, f/8, f/22 and f/32;
moderately high at f/11 and f/16.