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Duncan I have both the GSO Coma Corrector and the Baader MPCC Mark III and they both work in my GSO 16" dob, but I use only the Baader for imaging in my 10" imaging newt which has a GSO linear rail focuser. They both can be taken apart to attach to a camera (dslr) but only the Baader provides additional infocus range so I think its your safe bet. The Baader is also lighter than the GSO unit, which can help with dob balancing. I know people that swear by the Televue but its big, heavy, and expensive. Having looked through a Televue I can't see it as any better than the Baader and you have to adjust the top for various EPs.
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