Thanks for your comments JohnG and Jase. At the moment, it all seems too hard, and I shall satisfy myself with "near enough is good enough". I'm fairly confident of being able to get to 30 mins without too much problem, and when I have become familiar with imaging and processing, I shall give consideration to a higher degree of accuracy. I do have a PAS on the Vixen, but I have never been able to pick out Octans through the PAS. I can identify Octans with binoculars, but the PAS is hopeless, it's just too dark to see anything. With the supplied light fitting, all that can be seen is a bright red glare, no stars. I'm only interested in "pretty pretty" at present, but if I go down the serious road (note that I said IF) then I shall reconsider what I have to do.
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