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Thanks Tony
Some of those were cropped but ngc 6215 wasn't. I'm not sure exactly how many frames I had for each one, I normally take heaps of frames (up to 100) but I can normally only use 50% of them as the platform is just a little bit uneven in the way it tracks.
I'll try using flats, I tried some tonight using a white shirt stretched over the scope and pointing it at a lit room but that didnt really work. I read somewhere that you can use a white computer screen so I might try that tomorrow night.
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