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The problem is most likely exposure time. 3s isn’t going to be enough to get over read noise unless you’re shootings F/2 in a red zone.
A single 120s exposure is going to look better than an hour worth of 3s exposures. If you partially dither 1200x3s exposures you’ll end up with a smooth but not deep image. A single 120s exposure will not be as smooth but will look a lot better.
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