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Steve, I might say though, the statement "Dark 5 times the total image integration time" just isnt viable these days, not even 2 times.
I sometimes and many imagers now image (especially NB) to a total of 5 or more hrs per filter. A 25 or even 10 hr dark is just rediculous. I have found 10 stacked dark subs at the same exposure as the image subs is about as far as you need to go (youd be hard pressed to see much difference in more than 3 dark subs), regardless of total image time. The noise reduction acheived in the dark past 10 subs fast becomes a case of diminishing returns, cant see the point in much more than about 10 subs.
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