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Mick, I recall that you did have a 10" Skywatcher Newt, and I believe you mentioned that the optics are on a par with those in GS Dobs. So I guess you have a fair idea of what the mass produced Dobs are like.
At the other end of the equation, if you come along to Snake Valley I'm sure Bird will let you have a peek through his 13" (mirror by Mark Suchting). We can check out some 12" Dobbies too (Ken, Wombat) at SV, to gauge what difference the aperture makes.
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