luckydude said:But when birds are moving fast it lets me down. Works great for hockey, great for more or less stationary birds, great for the fire department helicopter fly by, birds in flight against a noisy background w/ the 600mm? Not so much.
Focus is the issue for me and BIF.
Interesting. I've not had any significant issues with my 1D X and 600 II (without or with a MkIII TC). Perhaps the iTR feature (the main difference between the 1D X and 5DIII AF) makes more of a difference for BIF than I thought.
Below are a few examples (not generally what I consider good shots, but they do show BIF tracking against a complex background):
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