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I know I'm not an expert like you guys and shouldn't probably be posting an answer here.
But it seems to me that the temperature fluctuates during the course of the night anyway, so if you take your darks at the end of the night, it may in fact be 7 or 8 degrees cooler than in the beginning of the session.
So to get accurate darks, shouldn't they be taken at the end of each individual image. Whether it is taken manually or using the in camera dark subtraction.
But if there is cloud coming up over the horizon and you know that time will be limited, I guess the only thing to do is grab what images you can while you can and take your darks later.
With the Gstar, I just image for x number of minutes, whack the end cap on and continue to image for another x number of minutes. You never mix up which darks go with which set of video images that way.
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