Nikon Nikkor 50mm f/1.4 AIS (Type 2)
Nikomat FTN with mirror and diaphragm prefire

Vignetting = NA @ f/1.4, B @ f/2, A- @ f/2.8, A thereafter
Distortion = slight barrel

Aperture Center Corner
f/1.4    NA*    NA*
f/2      B      B-
f/2.8    B+     B
f/4      A      B+
f/5.6    A-     A-
f/8      A      A-
f/11     A-     A-
f/16     B      B

Notes: * = not available. Moderate contrast images at f/2 and f/16;
moderately high contrast images at f/2.8 to f/11.