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While not overly qualified with DSLR darks, I am leaning with Gerald.
With my cooled CCD I can usually get away with a master dark.
My gut feeling with the DSLR though is that you should take them at the same time, and preferably interspaced with your lights. Take a few lights, shoot a few darks, take some more lights etc. That way the sensor temp is near or perhaps closer to that which exposes the darks.
Anyway Baz, try Gerald's experiment, can't hurt. Post the results.
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