I use A1 Servo for bird flight shots and one-shot for static shots (inc perching birds). Having said that, recently I have been trying A1 Servo for almost all my bird shots and as it seems to work ok. I think I am right in saying that A1 Servo only uses the centre focus point for the intial 'lock' but after that it will use all availble focus points to keep track of the subject.
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