After I posted: I'm not sure if mine is just a defective > > example, but sometimes it just won't autofocus the lens and I can't get it to > > behave until after I've turned the camera off and back on. After losing a shot > > or two to this problem, my enthusiasm for this item has dwindled quite a bit.
Shaun replied: > It depends on the lens in use as well. Make sure it is at least an f4.0 > or preferably faster (i.e. f2.8 is great). Also make sure the lens is > set to infinity, and that the camera AF is set to single rather than > servo focus. It will work on servo, but will easily zoom off somewhere > else if the point of focus changes by as little as a couple of millimeters. It's usually a 50mm f/1.4 and, after getting advice on this list several months ago, I make sure to set it to infinity.
