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Fiddly is right! I thought I could speed things up by slewing to a bright star, focusing on that with live view, then slewing back to my target and beginning to capture.
Sadly, I've realised that's not enough. So I do that, and once I'm back on my target I take a series of 3 or second, ISO6400 "snapshots" (Backyard EOS allows you to take a quick and dirty jpeg-only snap for this purpose). Between each one I adjust the focus a *tiny* bit trying to get the FWHM value as low as possible.
My experience with astroimaging so far is to remind me that, sometimes, there are no shortcuts :-)
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