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- Chris
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I think what Bill is trying to convey, with bird photography you are nearly always cropping the images. As an example, when cropping down to 2500 x 1500 or whatever, the images are cleaner form a FX camera than a DX camera. It's what I have also found from switching from the D7000, D7100 to D750. It's bit harder for me to tell on my current D810 as I am using a different lens to the 300mm f4 AFS lens I had on D7100 and D750.
Sure, I agree, if you're cropping down to the same size. But you would never be cropping to the same size because you already have to crop 35% (if my maths is right, which it's probably not) of the image to even get the same size as the d7200 starts with. Then you have to crop further if neither D7200 or D750 have the birds full frame. So say you had to crop the d7200 image 50%, you'd have a bird made up of 2000px high. On the d750 you'd have a bird made up of 1312px high. As I've said, whether or not there's more noise on a 2000px image from DX vs a 1312px image from FX, only testing will tell. As Bill has tested and says he prefers his d750, that's fine