"John Savard" <> wrote
> On Tue, 25 Apr 2006 01:42:49 -0400, Davoud <star@xxxxxxx> wrote, in
> . The corrections of the Ritchey-Chretien design,
> though, are applicable to designs with large central obstructions, which
> is a problem with the Lurie-Houghton design as well.
Interesting that you should mention the Lurie-Houghton. A friend of mine
is Mr. Lurie's son and last fall I had a chance to view Mars thru a 6-inch
L-H that he had inherited. The view was very nice but certainly didn't
compare to what my Obsession 20 (set up right next to it) was showing.
Another friend was imaging Mars that night just a few feet away with a
webcam and his Q3.5. In an observatory dome not far away there was a 20-inch
RC also observing Mars, and there was also an AstroPhysics 6-inch F/12 APO.
The Obsession was giving the best views.
> ....... In the case of the Questar, what
> may be forgotten is that for some people, convenience and portability
> can be greater constraints than cost.
Yes, and that probably applies to the major buyer of Questar products
right now: the US Army.