[APML] C9.25 (was: Another intro)

[Matt BenDaniel <matt@starmatt.com>]

Tom,

John Boudreau and Sean Walker have been imaging with a C9.25 for a couple
months. They say its field is flatter than the other Celestron and Meade SCTs
they have used, but the field is not totally flat. They say it has less
mirror-related focus shift and less thermal sensitivity, too.

Some of the resulting images have been posted to
http://mysky.org/mysky/?keyword=walker
WARNING: Some of those images were taken with CCD and may not be suitable for
film-only persons. <g>

Matt

Tom & Lou Krajci wrote:

> From: "Weist, Jeff" <weist.jeff@broadband.att.com>
>
> >...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.
>
> I've heard rumors that the Celestron 9.25 has a rather flat field (at least
> as far as commercial SCT's go), which is good for astro imaging.  You'll
> find it hard to get small star images at the corners of commercial
> SCT...various aberrations, plus a very curved field.
>
> Has anyone heard this rumor about the C 9.25 also?  (I don't have any hard
> facts to back this up.)
>
> Tom Krajci


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