Ultimate planet killer! 18" f/70 mirror!!!

[mental4astro]

If this doesn't put hair on your chest, nothing will. Candidate for the ultimate Nasmyth telescope? With a focal length of over 32m. Bloody hell!

18" f/70, fl 32.375m, mirror (http://www.cloudynights.com/classifieds/showproduct.php?product=86440&sort=&cat=26&page=1)

[AG Hybrid]

Let's be honest. In its current form it is completely impractical and pretty much useless. A good candidate for a faster f/ratio re-figuring. Very well priced though.

[Don Pensack]

Without refiguring, the scope could be made with a concave secondary and a flat tertiary. It might, at that point, be a relatively long f/ratio (perhaps f/20?) planetary scope.
But the secondary would be too large for planetary contrast with that configuration.
I agree it should be refigured into something much shorter.
Assuming the glass is decent, regrinding to, perhaps, an f/5 length would be able to use a small secondary (under 20%) and be superb for planetary and lunar work.
and not too shabby on DSOs, either.