Ken,
Thanks for that.
Yes, I agree the PHD2 guys are very helpful. They implemented the spectroscopic slit guiding following my request.
The reason behind my questioning the exposure control was that in spectroscopy we generally don't have an option of guiding on fainter stars if the target star is too bright. It would sometimes be easier to reduce the exposure to give "better" results. I then worry about chasing seeing at 0.5sec etc. exposures.
(I have to say I have resorted to guiding on the secondary reflection from the slit plate to over come this.)
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