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Message: <blockquote data-quote="velikiuzhas" data-source="post: 467435" data-attributes="member: 39874"><p>Thank you, Mike and Pretzel, for your feedback & suggestions. Unfortunately, moving back gradually does not seem to resolve the problem. The thing with this lens is that it focuses smoothly and tack-sharply up to about 30-40 meters, then it loses it (as do I, when I'm trying to shoot a bird that's perching and preening in plain view just beyond that distance). At the same time, if/when, from the same vantage point, I replace it on my camera with my cheaper and optically inferior Tokina 300mm f4, then I can focus well beyond 50 meters even before reaching the infinity mark. Do you think this focusing limitation on the manual Nikkor 300mm f2.8 somehow be the result of compatibility with the narrower DX frame of my Nikon D7000?</p></blockquote><p></p>