Canon FD 50mm f/2 (bayonet mount, S.C.)

Canon FD 50mm f/2 (bayonet mount, S.C.)
Canon AE-1 with self-timer only

Vignetting = C @ f/2, A- @ f/2.8, A @ f/4
Distortion = none

Aperture Center Corner
f/2      B-     B-
f/2.8    B+     B
f/4      A-     B+
f/5.6    A-     B+
f/8      A-     B
f/11     B      B
f/16     B+     B-

Note:
moderate contrast, except moderately low at f/2 and f/16.