Re: [APML] ST-4 with a Lumicon 2.5X CCD Telecompressor

["Anthony L. Mehle" <amehle@pol.net>]

Tony Pilato wrote:
> 
> Good Evening,
> 
> I have searched through the archives and have found little on the subject of
> using a Lumicon 2.5X CCD telecompressor  for a long focal length SCT with a
> GEG (other than some good advice by Wil Milan). I am using a CG-11 with a
> Lumicon GEG and often see lot's of "E's" when guiding with an ST-4. The
> seeing in Binghamton is usually pretty poor. I am guiding at ~F/10-F/11 and
> imaging at F/7.5 (lens behind the prism). As you may already know,  guiding
> with "flying seagulls" sometimes plays havoc with the ST-4. I often don't
> get the tracking that I like.
> 
> Does anyone else know about /or have used a Lumicon 2.5X CCD telecompressor
> with their ST-4 to improve guiding performance. Will this help out my
> situation?
> 


Hello Tony-

I have had good success with the Lumicon 2.5X telecompressor with the
GEG on my
12" LX-200 in the same configuration you are using from the similarly
crummy skies
of Northeast Ohio.Also got many E's until the telecompressor was added.
Now I also use
CCDTRACK just because I like to see what is happening during guiding.I
can get good tracking with even slightly out of focus guide stars,ones
that look like noses, and the ST-4 hangs onto them like a bulldog.Hope
this helps.

Tony Mehle
amehle@pol.net

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