Quote Originally Posted by Chris
Hmm.....I have seem to have several focus issues with my 7D and 70-200mm 2.8L IS II. I get the gut feeling mine is just not right.....It sounds like I am not alone. I am going to order the Lens Align and give it a shot.

Chris


I am not sure there is really anything wrong with the one I have, I think it is just the way the AF tracks and works with the Zoom.


The 1D Mark IV was the most noticeable. Maybe because its AF was the most accurate and it had the most accurate results. But out of all the shots, even though it would favor BF at 200mm and a FF at most of the other ranges, the focus point (zero number always fell within the DOF). It may be the way the designers intended, so that the AF system would produce the most accurate results possible at each length. In real life practice you might not notice this unless you were shooting wide open and fairly close. This may very well may be the way this lens is supposed to perform.


If nothing else, I know exactly how the lens performs at each length and I can adjust my shooting style accordingly. I took it with me today and took about 140 pictures. It performed flawlessly on the 5D Mark II.


I arrived at my opinions after 1044 test shots in two days with the 1D IV (not counting the 5D and 7D shots). I would be curios to hear someones perspective that has tested it very thoroughly.


Rick