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I agree with all the above, but if you don't already have the C11, perhaps look for one that has the "Fastar" of "Hyperstar" setup. This allows you to remove the secondary and use the primary as a BIG FAST mirror. This would get you round the frustrations of imaging with the native or reduced C11. It will however not really be suitable for DSLR type CCDs, so I may have you slightly off track here.
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