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Message: <blockquote data-quote="BackdoorArts" data-source="post: 199332" data-attributes="member: 9240"><p>What you are talking about here is that is referred to among bird photographers as the PPB factor, or "Pixels Per Bird".  It's definitely an "all other things being equal" measure, and when you're talking sensor technology they never are, but when it comes to extreme cropping and lens reach it's definitely a factor that's far more important to some types of photographers than others, as you've mentioned. If your subject is always going to occupy only a portion of your viewfinder then I agree that a DX body is your best option.</p></blockquote><p></p>