Quote Originally Posted by Jon Ruyle


In theory, one could use high pixel density to do better post-processing. For example, if one is willing to deconvolve diffraction, I believe more resolution is always better.
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Agreed. If sensors were advanced enough to record the actual phase of the light, then diffraction could be deconvolved perfectly (in theory). But as you point out, even without phase it's possible to get really nice results. High noise power at Nyquist can reduce the effectiveness, so it's more beneficial for low ISO shots.