Thanks folks. Stacking now. Unfortunately my data from last night is less great than I thought, so only about 23 usable 3-min subs from nearly four hours. Focus moved at some point. Oh well...!
I'm starting to realise that there's vastly more to stacking and processing than I initially suspected (much like every other aspect of this hobby), and I'm going to have to learn a lot more about how it works, what the myriad different options are, what benefits they each have and how best to wrench the best possible results from a cheap unmodified Nikon. I've been a photographer for years but nothing could have prepared me for this astonishingly convoluted, technically challenging process!
Cheers all, thanks for the help - results will be posted in the Beginners' section later tonight if they're not too embarrassing.
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