This thread is a classic example of what happens when certain people get into an argument over something and refuse to admit they could ever possibly be wrong about anything.
This whole issue is grossly overblown and if critical focus is in fact that critical to you, then you have a lot more issues to worry about than focus shift or the AF point sensitivity--why you would even be using AF at all in such cases is beyond me--or the way focusing screens work.
As I pointed out WAY earlier in this thread before everyone got sidetracked, one must draw a distinction between focus shift and focus uncertainty. The latter arises out of the method of focusing, whether it be automatic or manual and is even influenced by the photographer\'s skill and visual acuity. The presence of that uncertainty does not pertain to the presence of focus shift in the way a lens is designed. They combine to influence the resulting focus, but that does not mean they arise from the same phenomenon. It is possible to have one without the other.
Mar 13, 2011 at 08:45 AM
Previous versions of wickerprints's message #9398962 « Risk of focus shift issues in new 1.4/35? »
