Steve's words:
For an astronomical telescope, f8 is not that slow.
Schmidt-Cassegrains - the most popular off the shelf optical system -
are usually f10 (though focal reducers are available). I think what's
more important is the optical quality of the lens. A lot of those
inexpensive mirror lenses are not very good.
As for astrophotography with the O-GPS1...I've gotta get one!
--
Steve Sharpe
Steve, those reflectors have been quoted as "useable" and "entry-level"
by some. Orion's Starblaster gets cheaper as it comes without tube rings
and we provide the mount - fine with me. Didn't browse other brands but
that model in particular is not too long (optically) nor too dark and
better some "useable" tool at hand than a proper in the store. So much
for theory... and of course I'd add the O-GPS1 too as soon as possible!
:-)
--
luiz felipe
luiz.felipe at luizfelipe.fot.br
--
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