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HI MW, I started with a 4.5" f8 on a cheap EQ2(?) mount and it was surprisingly good. But it only cost me $50 so not a problem. But it did get me hooked and I built a 10" f5 not long after. The 4.5 is now with my granddaughter and in a dark sky area where they live. Still impresses me how well it does when I visit.
But I'd still advise going with at least 8" and preferably 10", the visual difference is considerable.
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