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An interesting use. I can see that for focusing etc. I usually use 3x3 or 2x2 binning for focusing and framing. 1x1 is too slow and too large an image. For critical focus 1x1 is good but slow.
Not 100% sure if it this applies to CCDs but I don't see why not. Dynamic Range on DSLRs is highest at lowest native ISO. Dynamic range is defined by well depth divided by read noise. As far as I am aware gain is applied during read out but before analogue to digital conversion so in effect it would be added to the read noise. That's why on DSLRs they have a native ISO range (amplifier gain before digital conversion).
So you lower gain when binning to prevent burn out bright areas?
Greg.
Also lowest gain is not necessarily the highest dynamic range point on a sensor and binning has a big effect on gain and dynamic range so to maximise your dynamic range you want to run at a different gain when binning.[/QUOTE]
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