Canon FD 100mm f/4 Macro (multi-coated, bayonet mount)
Canon AE-1 using self-timer

Vignetting = A- @ f/4, A @ f/5.6
Distortion = none

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