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I am lazy, but of late have come round to doing darks, especially with exposures getting up around the 10 minutes mark (un-cooled/un-modded 20D). So yes darks are essential for this length. With 30 sec shots maybe not, try one with and one without.
With the wide field stuff though, I reckon a decent flat is as or more important, from a vignetting point of view. Again, try it. Let us know too please.
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