Leif,
My 2 pics. This was not a scientific test but just a play. First outing of the 55 macro on the D2X. Breezy conditions ISO 400 - 1/400sec - F9 with no noise reduction.
For a proper test I really need a dead fly or similar to do a proper comparison between 6mp at f16 and 12mp at f13. ( no subject movement guaranteed )
My theory is that as the 12mp pixels are smaller then they will have the ability with the same lens to record finer detail. So provided f13 is the smallest aperture used on the 12mp sensor its cropped image will have greater detail than the 6mp sensor. I also think that a cropped f13 image will appear to have more sharp detail than one taken at f22 that has not been so highly magnified, but suffers from diffraction softness.
First suitable subject I find and I will do this test.
Don
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