[QUOTE=CraziestOzzy;1297730]G'day.
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One would think that for almost 10,000 grand that a telescope manufacturer would at least provide such information?
I know that for the same price, I could get a custom made scope complete with optical specs from the USA, but the postage is a deal breaker.
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As others have pointed out, your expectations of the above are a little high unless you are talking pre-owned scopes.
A 20" SDM will cost more than twice the skywatcher price.
I never received a test certificate before buying my 18" SDm, but then again, the mirror maker has an excellent reputation.
From all accounts the skywatcher mirrors though mass produced perform well. If you want to check out before buying, the head off to a few southern star parties, you may not see a 20", but there are bound to be other skywatcher reflectors on the field to give you some idea.