Quote:
Originally Posted by Camelopardalis
There is the software/driver binning, but it’s just downsampling.
The read noise of these things is so low I suspect the designers figure there’s no point in binning  |
Its the CMOS architecture. With CCD there is just one ADC. The electrons in each row are shifted down then on the bottom row, each pixel gets shifted to be read and digitised in the ADC. To bin 2x2, two rows are shifted down (and their electrons combined) and then two pixels get shifted to the read circuitry.
With CMOS there is an ADC on each row so the pixels on each row get shifted together to their respective read circuits and ADCs so there is no opportunity to combine the charges from each row before reading