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I found Mark's Deep Sky Optics website yesterday, and sent him an email. He has a 10" f6 mirror available, but unfortunately this is a bit big for my current needs. I was impressed by the promptness of Mark's reply, and if I was building a bigger instrument I would definitely look him up.
Thanks guys for the Andrews, Bintel & Telescopes-Austronomy references.
By the way, what does "GS0-Quality" mean?
Cheers
Martin
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