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well done ken!!!
dark frame are something i am working on too. With the scope it is easy, you put the telescope end cap on so no light comes through and you then take a long exposure of darkness (5 or 10 seconds, whatever you will be taking with your stars). The blue and red pixels should still show up and you can then subtract them in photoshop from your star image..
It is a field of study all in itself.
I will be doing some wide field with mine attached to the tracking dob.
It is so much fun!!!
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