Minolta MD 50mm f/1.7 Rokkor-X (multi-coated, metal body)
Minolta SRT-102 w/ mirror lock-up and stopped down diaphragm*
Distortion: none
Vignetting: B @ f/2, A- @ f/2.8, A @ f/4
Aperture Center Corner
f/1.7    B      B
f/2      A-     B+
f/2.8    A      A-
f/4      A-     A-
f/5.6    A      A
f/8      A      A
f/11     B+     A-
f/16     B+     B+
Notes: Moderately low contrast @ f/1.7, moderate @ f/2 & f/16, moderately high @ f/2.8, f/4, f/11, high @ f/5.6 & f/8; design favors contrast over resolution. * equivalent to "mirror and diaphragm prefire" procedure attained by use of self-timer on late model Olympus bodies.