I would still guess at the darks Lee. If you can, shoot the darks as you shoot the lights, if you know what I mean. I am lazy and have a selection of "library darks", but really the only way is to shoot them each night. With the 30 minute shots I use the library ones, but for something like 5 minutes or even 10 minutes I would shoot them every time. Try it and see.
Gary
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