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Hi Rob
I have a C11 and while I've been pretty pleased with it's potential for planetary photography, I've also seen equally good, or better, results from 9.25s. I'm sure a large part of it comes down to the expertise of the operator in capturing and processing. The 11 can take a very long time to cool down - up to 1 1/2 hours sometimes, and I've just bought one of the Lymax coolers which should help a lot.
I think you'd appreciate the extra aperture more on deepsky objects.
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