I've lost track of the details of this thread, but here's a few "common
problems" to check for:
Make sure you do a dark frame when you start the night, and whenever you
change the exposure time, or if you disconnect power from the guider.
Recalibrate if you change the effective focal length (ie, add a focal
reducer or anything like that), or if you change the orientation of the
guider wrt RA/dec directions, or if you make a big change in declination.
-John


>
>Well I just got in from what passes as a clear night around here in April.
>I
>got a chance to play some more with my 201. It seems it still has problems
>with trailing in RA. There may be problems in dec as well but I'm
>reasonably
>polar aligned so I don't see it. I have now tried exposures ranging from
>0.1
>seconds to 5 seconds and the problem persists. Tonight I was looking
>through
>the main scope while a guide scope was equipped with the 201. What I saw
>was
>a slow (about 4 second) oscillation in RA, where the star viewed in the
>main
>scope would move east then back to its starting point. I also tried longer
>calibration times, up to 5 seconds, with no difference. The only thing I
>have left to try (aside from a SBIG guider) is a longer focal length on the
>guide scope. I'm guiding with 900 mm focal length. Does anyone on the group
>have experience using shorter focal lengths when using a 201XT?
>
>Blair
>
>
>

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