Originally Posted by Jan Paalman
Great point, Jan! Both the frame rate and the shutter lag of the 5DII are better than a Rebel (although the frame rate is one shot per second better instead of more than double). AF on the 5DII is better than a Rebel's, too.
But just to be contrary [A] ffron might be deriving some crop factor benefit on angle of view - the lenses mentioned as being used for gymnastics are both telephoto, so the 1.6x crop sensor might mean not having to deeply crop the resulting images(after 'losing' a an effective 60% boost in focal length). If you have to crop a 5DII image by 1.6x, you end up with an image of lower quality and less than half the pixels of one from the 7D. The alternative (buy a longer lens) is a costly one for fast apertures at those focal lengths...
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