7D -- "Zone AF" vs. "AF Expansion" for BIF
I just read this nice article at Canon's site about the 7D's various AF modes:
http://www.usa.canon.com/dlc/control...articleID=3049
Toward the end they tout the Zone AF mode as being good for BIF, but I've been using the AF Expansion mode because it allows me to "aim" with the central focus point and gives me room around that for error. There's enough precision that I can attempt to focus on the head of the bird in flight. Also, if a bird lands within range, then I can put the focus point right on an eye.
Is anyone using the Zone AF mode? I don't see the advantage for BIF, or birds in general, but maybe I'm missing something. If I can, I want to "know" which point to expect to lock on, or at least get a very near by point.
BTW, I hadn't discovered the M.Fn button before this article and will start practicing toggling between AF modes quickly tonight. I'd been screwing around with menus on the back, which is not the way to go (too slow).
Thanks,
Dave