Nikon Nikkor 50mm f/1.2 AIS
Nikon F2 with mirror lockup and diaphragm prefire

Vignetting = B- @ f/1.2 & f/1.4, B @ f/2, A- @ f/2.8, A @ f/4
Distortion = moderate barrel

Aperture Center Corner
f/1.2    B      B-
f/1.4    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+     B+
f/16     B+     B+

Notes: High contrast at f/1.2 & f/16; very high at f/1.4 to f/2.8;
extremely high at f/4 to f/11. Contrasty at the expense of
resolution.