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I have been weighing up the options for a fast newt too.
So far I have found out that the GSO's do need a bit of fiddling to get them to work well, no surprises there. Apparently the secondaries are a bit undersize (63mm for the 6") and not offset. The new linear focusers are apparently better than the old GSO crayfords.
I've been toying with getting the 10" but basically just for the primary.
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