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That is a very nice capture David.
I seem to recall getting a similar effect to those rings once when stacking in Deep Sky Stacker.
I dont know why it came about but I think that I did a second stack without the bias frames and the problem then was not there...I know that seems odd and I have no idea how including the bias or not changed things or if it had nothing to do with the problem...but I mention it anyway.
alex
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