I have the Canon 60mm macro. I am using it on an a7r with an adapter that has no electrical connection to the lens. Shooting at f2.8 is useless for macro stuff. If I attach the lens to my Canon camera stop it down to say f10 remove it while holding the DOF preview button the aperture stays stopped down. My question is if this is a bad idea to do this? Will it hurt the lens if left stopped down for long periods of time?
It works fantastic and at any focus near macro with no vignetting and nice results.
Thanks for any thoughts.