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Thanks Stuart & Peter for the advice.
I have an 8" f6 Newt - the focal length is 1220 mm = .91 arc seconds per pixel at bin 1x1 on my QHY9.
You haven't convinced me that I could find good guide stars.
I have the programs Stellarium & WorldWide telescope.
Is there any way I could put my frame size into those programs &
rotate it to see if there would be any suitable guide stars at the edge of the field of view?
Is there any other program that can do what I need?
That way I could pick a guide star before I start a night's viewing.
My TS9 OAG also has 3 different slots in which to put the guide camera.
That could be organised well before imaging -
in other words - planning the night properly.
cheers
Allan
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