on 2014-08-05 13:50 Bryan Jacoby wrote
I think this idea of bigger/fewer pixels leading directly, as in through the very basic physics of photon noise, to lower noise is wrong-headed.I couldn't care less what the signal-to-noise ratio of
> _pixels in my sensor_ is. What I care about is the SNR of pixels in > the output image, whether that be an image displayed on a screen or > the dots made by a printer.
i have pondered this too, and i suppose the question is whether one could average the pixels on a 24 Mp sensor to get as clean a 12 Mp image as from a 12 Mp sensor; i suspect there are multiple factors beyond the number of photons hitting a photosite that make the relationship non-linear (so that lower Mp would net lower noise even after averaging)
but since in general we'd expect the 24 Mp sensor, in bright enough light, to capture much more detail with a comfortably low noise floor, i think we have to choose between low-ISO detail and high-ISO SNR
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