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Take the ASI094 I have, it has a 56k full well which means it’s at a gain of 0.293 which means that it takes 3.4 electrons for every ADU. This has nothing to do with QE and it also isn’t a bad thing. At gain 0 my camera has bang on 14 stops of dynamic range which means its using all 14-bits of its output. This is what’s important. At unity gain I have about 13.4 stops of dynamic range so it’s actually more difficult to control bright stars compared to the background.
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