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For set up and framing of an image I usually set the camera to 3200 Iso to capture a faint fuzzy, When I programmed the imaging run I set the Iso to 3200. I have never used such a high setting on a long run of images before. I tried it on M42 but was not happy with the noise and never published the image. I have no stock of 3200 darks either so I thought the run would be a waste of time. Needless to say I was pleasantly surprised with the result. As I mentioned no darks, flats bias frames used. A fine gradient removal was used to even out the image. A visible central bulge and a dust lane gives me the result I was hoping for.
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