In DX crop mode the D600 becomes a 10.3 MP DX camera, the D800 a 15.4 MP. I don't think you'll see a degradation with the D600 and the D800 should be an improvement.But don't fool yourself with DX crop mode on an FX camera. You will not get more reach. The only thing DX mode does is crop the photo, the same way you would crop in software. Len
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