Upload & Sell: Off
I may be doing something wrong, but I could never use an M42 (screw mount) lens well. I never could get it mounted where the aperture and focus read out facing the top and also when I changed the aperture and focus, it would loosen the lens. I did not have fun with them at all. Again, I may be doing something wrong. The M42 is a very popular mount, just not for me.