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Hi Asi, I think Houghy bought one of these recently so perhaps he can comment on how it is. I know there was some vintages of the Celestrons when the optics were less that ideal.
Me personally, I'd be wary of second hand optics. I like the protection of a warranty if things turn out not to be quite right (I have made use of this in the past). I think for a planetary scope you need the optical quality to be particularly high. Perhaps fine scratches are not of concern, but it makes you wonder if the scope has been well looked after etc. Recent Celestron optics have achieved a good reputation and the C9.25 rates very highly on quality. In star tests the c9.25 I bought seems pretty close to the Mewlon which has 1/20th wave optics.
I guess it's always a bit of a gamble whatever you do and a compromise of money versus performance etc... I'd love to have a Mewlon 250, but at $10,000 for the OTA I was happy to compromise on the C9.25 - in terms of performance per $ I reckon it must be in front.
cheers,
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