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Message: <blockquote data-quote="Ken B" data-source="post: 790208" data-attributes="member: 37030">My main lens for walking around opportunistic bird pics is a Tamron 70-200, 2.8, which I’ve had for 6 years and had success with on the D7100.  I’ve also used the Nikon 200-500.  I also have the Nikon 18-200 for DX.  All are great on still subjects, none are good with BIF.  Very difficult to grab focus.  To help diagnose, I rented a copy of the identical Tamron, and had identical results after calibration. I usually delete out of focus shots.  I’ll look for examples, and if I don’t have any, I’ll go out and shoot some BIF.Thanks for the help.My next thought is to rent another D500 and see if there’s a difference.</blockquote>