I'm sure you're right, I've looked through a proprerly collimated 14.5 and
it was gorgeous. I'm willing to bet that if an f5 or f6 mirror by Mr.
Zambuto was available in 20" (and you had a cherry picker to lift you so you
could look through it) it would look a smidge better.

"Ratboy99" wrote in message
...
About 25 years ago, I had the pleasure of meeting John Dobson.
I spent most of
an evening with him up at Mt. Rainier. He mentioned that he thought
parabolas
of short focal length were very lacking visually. At that time, he
felt
anything less than f/6 was questionable.
I don't know how he feels now. But I
do believe he was (and is) an authority on Dobs!


Sigh.

Probably a bit different now if he's looked through any Zambutto equipped
Starmaster. Mine's an 18" F4.3, and I'm not the expert John Dobson is, but
the
scope is not "lacking visually" regardless of who you ask.
rat
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