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Message: <blockquote data-quote="aroy" data-source="post: 507973" data-attributes="member: 16090"><p>The longer the lens the more pixels you have for the bird. As long as those numbers matter it is good to have the longer lens, but if can use only 1000 or at the most 1500 pixels on the long side, then you might as well as crop using a smaller focal length. The 300mm F4 is ideal in such cases as it is much sharper than most of the long zooms so that even downsizing may not match the crop IQ.</p></blockquote><p></p>