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Hi Greg, The 7" f/15 maks from skywatcher (sold as celestron in the US) are readily available. These are a bargain and will do better than 8" SCTs. You'd have to look at a C11 Edge to do significantly better.
As Alex indicated there are other exquisite maks - notably from Intes, Santel, AP, TEC or APM/Wirth, but they're seriously rare and won't be within your budget, even secondhand.
Other alternatives:
- a long-focus Newtonian eg an 8" f/9 or 10" f/7, sheer size and mount will be a pain;
- classical cassegrains with small secondaries (ie not the fast RC ones from GSO).
Last edited by Wavytone; 08-11-2019 at 06:18 PM.
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