Canon FD 200mm f/2.8 (bayonet mount)
Canon EF w/ mirror and diaphragm prefire

Vignetting: A- @ f/2.8, A thereafter
Distortion: pincushion

Aperture Center Corner
f/2.8    C-     C
f/4      B-     C+
f/5.6    B-     C+
f/8      B      B-
f/11     B+     B-
f/16     A-     B-
f/22     B      B-
f/32     B-     C+

Notes:
low contrast at f/2.8 and f/4,
moderately low contrast at f/45,
moderate contrast at other apertures.