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Re: [APML] Another intro (CG-9.25)
Hi Jeff,
I own the C9.25 on a G-9 mount. Regarding the optical quality of the C9.25 I
can confirm what has been said by other list members. The optical quality is
fine. The primary mirror is slower than that of a C8 and I read or heard
that Celestron redesigned their SCT-design for the C9.25 to achieve a
flatter field. On the other hand the focal reducer/field flattener works (it
reduces the focal length at least) but may not be the optimum design for the
different field curvature compared to the other Celestron SCTs. The mount is
OK to handle the C9.25 plus a camera and some accessories. But it should be
mounted on a pier or a very sturdy tripod. The aluminium tripod that is sold
with the mount is not sturdy enough for astrophotography or visual observing
if it is windy. Be sure that the mount has two bolts to lock the
altitude/elevation of the mount. Mine has only one that cannot be tightened
enough and there is some play. Nevertheless it is a great mount and if you
know its shortcomings you can work around them. I am very happy with my
CG-9.25.
Manfred Mrotzek
Deutsche Homepage: http://www.astronomie.megapage.de
English Homepage: http://www.astronomie.megapage.de/index_en.htm
----- Original Message -----
From: Weist, Jeff <weist.jeff@broadband.att.com>
To: <astro-photo@seds.org>
Sent: Wednesday, August 22, 2001 3:38 PM
Subject: [APML] Another intro
> I am also new to the list and astrophotography (but not astronomy) and
want
> to introduce myself -- and be presumptuous enough to ask a question. I am
> fortunate to live in a relatively dark area in the mountains outside
Denver
> and have burned a dozen or so rolls of film with my little refractor
without
> much to show for it (but I'm learning). I have been planning for a long
> while to buy a bigger scope and the demands of photography have focused my
> search. After several months of research (and watching APML), I seem to
> have things narrowed down to an 10" LX-200 on a wedge or a Celestron 9 1/4
> on a G-9 mount that I found used in great condition. (A good refractor on
a
> good mount seems to be beyond my budget at this point.) I know I may be
> opening a can of worms here, but I would appreciate any guidance the list
> may have regarding the respective mounts, etc. for use in
astrophotography.
>
> Also, without getting greedy, I wanted to ask if anyone has any
experience,
> good or bad, using a Pentax LX camera for this work. I already have
several
> Pentax lenses from an old body and don't want to have to replace them, and
> the LX seems to be the only Pentax good for astrophotography.
>
> Thanks for looking at this and I look forward to watching and learning
from
> a great list.
>
>
>
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