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By my understanding, binning still increases SNR to some extent but not in the same league as a CCD. Binning a CCD combines the pixels and they are read once, so 2x2 binning combines the signal of the four pixels but you only get a single shot of read noise (It might be more than the unbinned read noise, the cynic in me thinks that looks like a free lunch to have up to four times the signal to noise as 2x2 binning)
The binning in a CMOS is done in software after the pixels have been read so there is no read noise advantage.
Last edited by The_bluester; 12-10-2019 at 09:21 PM.
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