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Thanks Brett, Frank and Frank.
I think ill fix up the stars on this one, I already did exposures just for them.
Frank. I took the standard library of darks just for this object, because every time you change the rotator position, you need a new set. I never take darks for NB, I found they are just not needed. The background is always so dark, you dont get gradients either.
Darks are from a standard library I use for every pic, I updated every 6mths or so. Darks are always 10 off combined. 10 is about optimum for any exposure length IMO, the total light exposure time is irrelevant, regardless of the number of subs taken, as darks are applied to each sub.
I use CCD stack, but any astro app is much the same, you select the dark to suit the light exposure length and click calibrate, it then calibrates all the subs automatically (any selected number of subs you wish, its the same one operation), some apps select the right dark automatically too. Makeing master darks from 10 dark subs is something you do once when you take the darks, and is handled by astro apps automatically with a few clicks.
If your question really is are the darks/flats or procceedure different for very long total exposure times/large no of subs, no it isnt, its exactly the same, as its only each sub that counts for calibration.
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