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Hi Muddy
If your image capture software has a Histogram display that can show you how many photons and at what brightness level you are collecting, then I recommend you use that function.
My software, K3CCDTools, shows a Histogram bar starting at 0 and going to 255 (8 bit). If I see the number 255, I know that the image is too bright and that anything over 255 is “seen” as white and therefore "wasted".
I usually tweak the brightness, gamma or gain to keep the Histogram between 150 and 230 so the whites do not saturate.
2 to the power 8 is 256, hence the Histogram range from 0 (black) to 255 (white).
Hope that makes sense
Cheers
Dennis
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