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Re: [APML] Help! Advice on collimating a C14
Hey Andy,
--- Andrew Clegg <andy@w4je.com> wrote:
> This may not be the best place to ask this question, since everyone
> seems to use RCs or refractors, but I thought I'd ask anyway...
Plenty of us use SCTs.
> I have a C14 CGE, and I am having one &$%#^ of a time getting the
> thing
> collimated. Deep sky views are spectacular, but lunar and planetary
> views
> are basically horrible (my Orion ED80 gives better views).
This tells me that you may be limited by the mount itself. There is
going to be some vibration transmitted by the drive motors through the
fork arms. Over the years I have often been disappointed by the views
through my 10" and 12" SCTs. But, they have performed admirably on long
exposures on DSOs. Once in awhile, when all steadies for a brief split
second, you get clear, sharp views through an EP, but then that is
lost.
How is your scope used? The tripod itself will also put a limit on what
you see. Putting the OTA on a steady, sold pier will probably be the
only thing you can do. My experience shows that only occaisonally will
I be able to use even a 17mm EP and get steady views. More often, I was
limited to the 26mm if I wanted sharpness. If you are expecting a stock
scope to provide crystal clear views of the moon with a 7MM EP, I think
you may be asking too much.
Just my 2 cents,
Alan
=====
SCT Astrophotography: http://www.pbase.com/avoetsch/astrophotography
FS-102 G-11/Gemini: http://www.pbase.com/avoetsch12952/tak_fs102
& http://www.pbase.com/avoetsch12952/fs102
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