Originally posted by elho_cid For some application you can try focus bracketing. For landscape it shouldn't matter that much, there the DOF if deep enough and often you want to use hyperfocal settings.
If only this were true! I have actually found that the focusing problems occur only at mid to far distances. (This is similar for what other users have experienced with other systems). DOF is a bit of a myth, but one that worked with film. With digital sensors at this level of accutance, its limitations are much more acute.
It is for landscapes in particular that I am not at all yet statisfied that the AF is refined enough. Only time and experience will satisfy me one way or the other.
The point seems to be that with, say a 160mm lens at f8-11, there are probably a hundred, if not several hundred, discrete distances from 30' to infinity. I am not sure that either the AF system, nor more particularly to lenses and their drive systems, are capable of resolving to this level of accuracy. With MF digital, that makes a big difference. The focus throw on my 35mm from 4' to infinity is about half an inch. That might not cut it.
In the studio, AF is great, as long as it's on the right spot.
- N.