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Hi Scott,
For the C9.25 I'm using the Celestron radial guider behind the focal
reducer with the Quickcam Pro camera in the guiding eyepiece holder.
The program is Astrovideo with the settings minimum 20 ms interval,
40 ms standard interval and 200 ms maximum interval with the
handcontroller at 1.5x sidereal speed. Exposure time is 2s. The
interface between the computer and the mount is a relay box made by
Albert van Duin.
This whole combination works perfectly with the 80 ED refractor, with
the C9.25 there is still a 1 arcsec wobble in the RA because for some
reason Astrovideo has about 5s delay in processing the guiding
images.
Sofar I was able to find a guide star for every object, it is easier
however to find guide star when using the 80ED than with the C9.25,
because the 80ED has a larger focal plane with less vignetting.
Cheers,
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