Canon FD 28-55mm f/3.5~4.5 Canon AE-1 with self timer only

@ 28mm setting Vignetting = B- @ f/3.5 Distortion = pronounced barrel 
Aperture Center Corner 
f/3.5    B      B 
f/5      A-     A- 
f/7      A-     A-
f/10     B+     A- 
f/14.5   B+     B+ 
f/20     B      B 
Notes: low contrast @ f/3.5, moderately low @ f/5, moderate @ f/10; overall high resolution at the expense of contrast.

@ 43mm setting Vignetting = A- @ f/4 Distortion = none 
Aperture Center Corner 
f/4.0    A-     B+
f/5.6    B+     B 
f/8      B+     B 
f/11     A-     B+ 
f/16     A-     B+ 
f/22     B      B 
Note:moderate contrast throughout.

@ 55mm setting Vignetting = B @ f/4.5 Distortion = moderate pincushion 
Aperture Center Corner 
f/4.5    B      B 
f/6.3    B      B 
f/9      B+     B
f/12.5   B+     B+ 
f/18     B      B+ 
f/25     B      B+ 
Note: moderate contrast; difficult to determine actual shooting aperture; effective focal length at long end is approximately 52mm.