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Good going Peter!
It looks like there might be a slight touch of field rotation going on in that pic.. the stars in the upper right hand side of frame look nice and round where as the ones down the left side look a little eggy.. Either the camera wasn't dead square in the focuser or the polar alignment is out by a little. It doesnt take much when you're running 20 minute subs to encounter field rotation, the alignment is fairly critical at that kind of exposure length..
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