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<blockquote data-quote="BackdoorArts" data-source="post: 436500" data-attributes="member: 9240">I think in any situation decent light and contrast in the focusing area is going to be key to getting auto-focus to work properly, regardless of the camera specs and lens.&nbsp; The crux of your question is really how quickly does the ability to lock focus degrade as you move away from center at near-threshold conditions?&nbsp; To truly know that you're going to need a controlled environment and a set of focus pattern charts, which will then give you a technical answer, but not necessarily a practical one.&nbsp; I shoot with my D7100 and Sigma 150-500mm quite a bit, and that's f6.3 at the long end.&nbsp; I rarely have an issue with it focusing anywhere in decent light, even with dull birds on a cloudy day.&nbsp; Occasional focus hunting, but that's usually when I vary distances greatly (i.e. going from a hawk flying over to a bird 20 feet away on the deck).</blockquote>

[QUOTE="BackdoorArts, post: 436500, member: 9240"] I think in any situation decent light and contrast in the focusing area is going to be key to getting auto-focus to work properly, regardless of the camera specs and lens. The crux of your question is really how quickly does the ability to lock focus degrade as you move away from center at near-threshold conditions? To truly know that you're going to need a controlled environment and a set of focus pattern charts, which will then give you a technical answer, but not necessarily a practical one. I shoot with my D7100 and Sigma 150-500mm quite a bit, and that's f6.3 at the long end. I rarely have an issue with it focusing anywhere in decent light, even with dull birds on a cloudy day. Occasional focus hunting, but that's usually when I vary distances greatly (i.e. going from a hawk flying over to a bird 20 feet away on the deck). [/QUOTE]

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