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The elongation is in R.A. only, and is a practically perfect straight line for as long as I have left it tracking, which is about 7 or 8 minutes, which, as the Dec tracking is as good as ever, shows that my P.A. is as good as
usual. I thought for a moment that I may have had lunar or solar tracking
enabled, but not so. It wouldn't have made that much difference anyway.
I haven't thought to see whether the R.A. tracking is running slow or fast, although I can't see how it could run fast. The really confusing thing
is the huge disparity in tracking quality between targets on opposite sides
of the meridian.
Thanks Jennifer for your suggestions; all comments will be taken on board, as they say.
I would use an OAG alpal, but a thin OAG and guide camera are beyond my budget at the moment, plus L.P. would restrict my exposures to not
much more than the 100-120 secs I normally manage.
raymo
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