Quote:
Originally Posted by Hans Tucker
Sorry Peter but this comes across as a rather snobbish opinion.
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No. Not snobbish ..in the same way you could make a balsa-wood raft and cross the south pacific... why?
High index glasses make extremely long focal lengths an anachronism.
My old club had a 6" f12 behemoth.
might *still* have it...
My AP155 runs rings around it: much easier to mount and better corrected to boot.
Mechanical centration of 9" F18 optics I strongly suspect is an approximation at best.