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I did subtract a 'Flat' but when I took flats: I used a clean white sheet folded a few times and put it over the camera...and as you know it is a Celestron RASA with the camera on the front of the scope...the sheet made a 'cone-section' between the back of the camera and the sides of the scope...was that an alright setup? Or was that responsible for the problem seen?
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