For a given sensor technology, mostly the noise in pics is independent of the pixels. But for a high density sensor, the higher total noise due to the added pixels of the huge sensor is cancelled out by the higher 'signal', so the S/N ratio is the same. My question: for the best low-light performance, Is it possible to calculate the best possible MP for a set lens. But that won’t be possible, as the legacy wide open lenses cannot determine these new sensors, therefore we end up with the higher S/N of the added pixels, but cannot counterbalance it by a high signal
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