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Thanks all. The scope was a William Optics Flt 110 with a QHY-9. I don't have a field flattener so that may help in future. I am going to run 15 minute darks for this image but have not done so yet. It is three hours of 15 minute shots. I need to make sure I take flats and bias flats as well as darks. Next time.
Mark
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