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I don't think my polar alignment would be accurate enough for 20-30 min subs and I haven't got to grips with drift aligning. I think I would get field rotation if I tried stretching it out that far.
Hi Steve,
Have you tried doing polar alignment using your CCD camera?
I only just started doing that and boy what a difference! No more sitting at odd angles looking through the reticulated eyepiece!
You can start doing that at dusk as you only need to pick up a star so it doesn't have to be fully dark. You then would have it pretty perfect within 20 minutes or less of dark and ready to image.
I use Startarg from Andy's Shotglass astronomy to help. It has instructions in it to tell you what to do. Well worth it. Its an overlay on your screen and you then run CCDsoft as usual but follow the instructions to do your polar alignment. My tracking improved considerably once I did that.
Greg.
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