Thank you guys! Compared to the 7D, when doing BIF, the AFof 5DIII seems the same as 7D.... Kind of disappointed,I felt that it took about one second to focus and lock on the flying duck...maybe coz the 400mm5.6 is group E lens or duck fly a little too fast...? Will try the 300mm 2.8 to see any difference... Isn't that AF system is as same as the 1DX's?



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