R. A. Greiner wrote:

>
>
> I use the 216 for guiding when I do CCD imaging with the ST-7. That is dispite
> the self guiding capability of the ST-7. I found it easier to get a good
> guide star with a separate guide tube.

Wow, I have never had a problem to get my ST-7 to find a suitable guide star with
the self guiding chip. It seems that no mater where I point the thing, it is able
to find at least one star suitable for guiding. To me it's almost like magic. I
don't know how SBIG did it.

> I have had the 216 guide for up to
> several hours on a nice bright star.
>
> I also use the ST-7 as a guider when I do photography. The ST-7 is a wonderful
> guider when you use the big chip. No problem finding a really great guide
> star.
>
> Doc G <http://www.mailbag.com/users/ragreiner>

With a well focused and centered guide star the extra area of the chip is
useless. I guess it would be helpful in locating the guide star if it wasn't
centered well.
Chris Vedeler
http://www.isomedia.com/homes/cvedeler/space.htm
Tucson, AZ

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