Minolta 50mm f/2 MD (plastic body)
X-700 w/ self-timer
Vignetting = B @ f/2, A- @ f/2.8, A thereafter
Distortion = slight pincushion
Aperture Center Corner
f/2      B      C
f/2.8    B+     B
f/4      B      B
f/5.6    B      B+
f/8      A-     B+
f/11     B      B+
f/16     A-     A-
f/22     B+     B+
Notes: Moderate contrast at f/4, f/11 and f/22; moderately high contrast at f/2-2.8, f/8 and f/16.