Russ
Well-known
Canon Canonet QL17 w/ 40mm f/1.7
Vignetting = B+ @ f/1.7 & f/2, A- @ f/2.8 to f/5.6, A thereafter
Distortion = slight pincushion
Aperture Center Corner
f/1.7 C+ C+
f/2 B C+
f/2.8 B+ B-
f/4 A- B
f/5.6 A- B+
f/8 B+ B+
f/11 B B+
f/16 B B
Notes: Low contrast at f/1.7; moderately low contrast at f/2; moderate contrast at f/2.8 and f/5.6 to f/16; moderately high contrast at f/4.
Vignetting = B+ @ f/1.7 & f/2, A- @ f/2.8 to f/5.6, A thereafter
Distortion = slight pincushion
Aperture Center Corner
f/1.7 C+ C+
f/2 B C+
f/2.8 B+ B-
f/4 A- B
f/5.6 A- B+
f/8 B+ B+
f/11 B B+
f/16 B B
Notes: Low contrast at f/1.7; moderately low contrast at f/2; moderate contrast at f/2.8 and f/5.6 to f/16; moderately high contrast at f/4.