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Originally Posted by JohnH
Is there really no difference between an image of, say, 120s binned 2x2 in hware and one of 120s binned 1x1 and then processed in sware?
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There should be no difference. Unless there's some other magic performed in the firmware and they're not telling us about it (personally, I've never come across a proprietary summing algorithm, but we can't say for sure).
EDIT: RickS points out that there is in fact a
difference (it is done at the hardware level) and there is one important benefit to hardware (summed) binning; read out noise reduction.
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Is it just that the default behavious in H'ware (sum?) and S'ware (average?) binning are not the same?
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I guess that depends on what you define as default behavior; In Nebulosity 2.x, for example, you can choose from the menu Image->Bin/Blur-> and you'll have a choice of 3 operations; "2x2 bin: Sum", "2x2 bin: Average" and "2x2 bin: Adaptive". So I guess, at least in Nebulosity, there is no default behavior when it comes to binning.