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Re the Flat, I simply stuck a piece of white photocopy paper in the filter drawer and set the camera to ISO 100 and auto exposure (I believe it shot at 1/500th). The purpose was to determine the sensor performance not for normal image processing. I have disassembled the camera again today and cleaned the sensor again. Inspected the sensor for possible foreign matter, pin shorts, etc and retested. The Flat has improved but the two lines are still there. I will accept it is damaged and replace it. In the mean time I will try to do some dithered subs when the sky permits. Thanks.
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