>>2912926ayy
Sadly for my perverse nature, the New FD 50 Macro (this shot) relegates the pentacks-M 50/4 (the first one) to the trash. Stacks more contrast and resolution, none of that flare you can see shading the top right of the first shot.
I had to use f/11 on the pentacks, and it was practically impossible to focus *perfectly* because of the lack of wide open resolution. f/8 on the Canon.
Canon really is the greatest.
What is amusing to me though, is that even on the much bigger sensor, right to the very edges they are trouncing the Canon EF 100/2.8 Macro that I used on the 550D for CA.