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I'm also still trying to get an idea whether 10 inch newtonians seem to be the maximum newtonian size most astrophotographers use for astrophotography. I don't think there's a good common equatorial mount for astrophotography out there for a 12 inch newtonian is there? Is 10 inch considered the size/weight limit, and then most people start looking at refractors or cassegrains?
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Had a 12 inch on a g11... And it was to the max weight wise, the dob tube itself has too many problems to make it a long term commitment, there are other companies producing 12 inch astrographs newts.... Will blow your budget to bits. So unless you have a loose 15k forget it.
The 10 is workable but I'd prefer a non dob version, or you just may have to beef up the tube around the focuser.