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Nice picture and nice rig. That's a lot on your GM8! I have a baader MPCC on my 5" newtonian. I do get a bit of coma still. I spaced the MPCC with the recommended 55mm from the CCD sensor but I've noticed that I get different star shapes in the corners still and it seems to depend on the filter I use on top of the MPCC too. So I guess depending on the light path and how many lenses you have to go through the distance slightly vary?
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