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Was this flat taken with your scope?. If it was, theres something wrong, or you dont need flats. Those images are way too flat for any image train ive seen. The whole point of a flat is to cancel dust donuts and other optical deficiencies, if you dont have any, you dont need flats. The exposure time also seems extremely short, too short and you may get shutter speed artifacts. I would say reduce the light output for 1 sec exposures or so.
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