by Jon

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Neither. MTF50 (The spatial frequency at which MTF drops to 50%) is. find a source of test datathat uses the program Imatest for its measurements, because that uses MTF directly. As for the measures you mentioned, to properly compare "perceptual megapixels" wrt sharpness/resolustion you need to take the square root because megapixels ~ pixels^2. So the ...

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