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So that takes care of sub length. I terms of total exposure, given that I am already behind the QE 8-ball by using a DSLR my strategy is basically to take as many subs as I can, however beyond about 200 and my PC is working pretty hard to integrate all the calibrated subs. So given that I typically use 3-4min subs during winter, that gives a total exposure of up to 10-14ish hours.[/QUOTE]
You can go longer. You stack as many as your computer can handle and label it a submaster. Then stack the next load and so on. Then stack the resulting submasters. I do that all the time as my computer bogs down with 10 x 1x1 binned 16803 images at 32mb each. You may lose a bit of your statistical rejection of outliers but it you still get the gain in SNR as far as I know.
Greg.
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