it depends, try to micro adjust a 105 macro or a zoom from the macro mode up to infinity . the best solution is to have all Canon lenses adjusted by a canon service center, a zoom for example 24-105 are adjusted in 8 different positions in the zoom range, in 5dmk2 we have one, and in 5dmk 3 we have 2 adjustments points.
Thanks for that info on the 8 different positions at Canon FSC. Did not know that.
I've always wondered about this though. Since AFMA can only be accurately set for one subject distance, is it better to get a lens that has a AFMA of 0 with your body than to adjust a lens to, say, -12 for 25x focal length subject distance?
For that matter, is it even possible to get a lens that focuses perfectly (AFMA=0) for both near & far subject distances?
I would guess so, as AFMA appears to me, in my understanding, to simply be an extra correction factor on top of all other correction factors (e.g. correction due to spherical aberration, etc.; more here: http://www.openphotographyforums.com/forums/showthread.php?p=109296); and a simple multiplier (or whatever exactly AFMA is) may not hold across the entire range of subject distances.