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Message: <blockquote data-quote="Jaff" data-source="post: 1649951" data-attributes="member: 42340">From what I've observed it comes down to two things, reach vs AF at f8 like if you want to use a 2x on your 500mm. The 1D obviously has the better AF and weatherproofing but the 7D seems to be holding it's own well, far better than the xxD models. And of course if you ever feel like doing movie. I have to say from my point of view I'm leaning towards the 7D.The best person to talk to though is GyRob as he has both.</blockquote>