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the mak and the 5 inch would be fine on the G11.
i have a 12 inch newt and 80mm ed guidescope plus accessories on mine , it is overloaded but functions just ok for imaging. i will admit id be better off with a lighter scope arrangement. note im shooting at f5 which is only 1500mm .
13 inch cassegrain.. might be a similar weight. but finding stuff without goto would be slow ... still that might be half the fun and challange.
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