Greg you need to expand out the Virtual memory in CCDstack. I stack out over 50 frames easily once I changed the settings. I made my VM setting to 4000mb, but will change this again soon. Having heaps of RAM helps control this. Currently have 16gig on board.
It would also help you to do the calculations in something like CCDAP which tells you how many darks you need for any given set of subs. Using dither helps too, so you will not need as many darks.
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