In doing some testing with my 40d and 3 other bodies (5d, 1DsMarkII, and 30d), my 70-200 f/2.8 lens will not focus correctly at any focal length on the 40d ... though it confirms focus it is slightly soft. I have verified this using live view 10x to focus (a feature I really like btw), the resulting image is always sharper. The lens seems to focus fine on the other 3 bodies, and other lenses on the 40d seem to be focusing ok (still testing that).
I've never had an experience with front focusing, but I'm puzzled by this. It seems if the body was the problem, all lenses would be an issue, and if the lens was a problem, it would be a problem on all bodies.
Anyone with thoughts or experiences that might cause something like this?