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Fred,
Whether the exposure is 1 second, or 600 seconds, there is always going to be some kind of dark noise present in the image.
And, if not, what's the harm? It's all part and parcel of calibration. It makes sense to me. Besides, how long does it take to run off 15-19 1-second flat dark frames? Not long. How long does it take to median combine them? Perhaps 10 seconds. No skin off my nose.
H
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