writes:
>I have a Celestron 80mm f/11.4 refractor. The focus mechanism is a
>common
>one on middle of the line refractors such as the Orion Short Tube and
>other
>Celestron refractors. It has a lock down screw which I used
>religously when
>using it as a guide scope. Take a look at it at:
>http://www.isomedia.com/homes/cvedeler/scope/scope2.jpg
>
>Chris Vedeler
>http://www.isomedia.com/homes/cvedeler/space.htm
>Tucson, AZ

I have used the same scope in the past and had to give it up because
the flexure of the focus was excessive. This includes all the S-80 and
the 80mm Orion Short tube. Of course the shorter focal length required a
barlow to get any power to guide with. I've found that any Vixen type of
(Japan) focuser had this problem. Most of our club that use a guide
scope have given up on this type. Even the ETX has less problems if the
mirror has a good fit. One scope of interest that I have seen used as a
guide scope was a 80mm Astro Physics long tube. I don't remember the
focal length but do remember the precision focuser. The shots with this
scope as a guider were tack sharp with zero guide flexure using medium
format camera. I have been using a guide scope for about 6 years with
mostly good results. The best trade that I ever made was when I traded
my refractor for the 2045-S and use the Lockwood guider
mount............ric

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