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11-07-2018, 01:36 PM   #16
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Join Date: Mar 2009
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QuoteOriginally posted by Bob 256 Quote
I don't disagree with what you're saying. More pixels will contribute to the "dither" of the original single pixel space since the noise element in each is random, however the randomness from the actual value that pixel space should have is larger (higher signal noise) for each of the smaller pixels. I'd have to open my statistics book to see how these would combine, but I believe you are correct in saying that four pixels added (actually averaged) with more noise (and that noise won't be twice the single pixel noise) will contribute to a better image, both noise and resolution wise.

There does come a point however, where reduction in the size of the pixels so much starves each one for light, that performance will fall off considerably. I have no idea if modern cameras are at that point yet (apparently not since the K-1 is such a great performer).
I think the point is just that you have to compare images at the same viewing size and once you do that, the smaller pixels actually produce a better image because there is more detail. Certainly the image won't be worse.

The bigger problem you run into if you have sensors with super high megapixels is eventually you run into diffraction. So according to the diffraction calculator on Cambridge in Color, you would run into diffraction around an aperture of 4.5 with a 144 megapixel full frame sensor. But that is not related at all to the OPs question.

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