Thanks, I have experimented. The results are different, "smoother" I think would be a non technical description, which I suppose is a nother way of saying noise. But the results are quiet reasonable. I am wondering if there is a half way point between the randomness of multiple exosures and duplicating. I can understand the randomness of noise resulting in noise registering on different pixels and thus smothing out. But I would have thought the overall S/N ration would be the same.
Needs more experiment
Roger
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