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I *want* to take separate darks, simply because of the time involved with ICNR (doubling the time out at the telescope, as already mentioned).
But I just haven't had good success with separate darks yet - they always end up spotty, and when subtracted from the lights, end up with black spots in my nebula.
It was possibly due to not being at the same temperature, but I haven't gone back to do more experimentation to eliminate or at least find the cause, yet. But I will.
For now, I'm using ICNR because the results are fantastic. But the plan is to go back to taking darks.
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