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I read recently that noise will be greater with a very long exposure than a shorter one. Not sure why, but perhaps some property of CCDs.
Did you notice that it had more noise than a shorter one at the same temperature?
I would have though the main issue with super long exposures apart from practical considerations of lost time if clouds come over, would be overfilling the wells and getting blown highlights. I suppose it would depend on what you were imaging. M42 or M8 would not be well suited to that strategy but a dim galaxy may well be.
Greg.
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