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Robin he's referring to darks for the flats.
So if your "flat light" is a 1 sec exposure, then you should be taking a "flat dark" of 1 second as well, and subtract them from your flat lights before applying the flats to your lights.
I don't take flat darks at this stage - my flats are usually 1/3s exposure so I didn't think it was worth it. I'll give it a try next time and see if it makes a difference (if I can force the camera to do ICNR on such short exposures).
Leon I know what you're saying, but sometimes it's the small things that make a big difference. I can tell immediately (usually) when an image hasn't had good flats applied. It's almost essential these days.
If subtracting darks from those flats makes the final image even 5% better for some people it will be worth it. Especially if it only adds a few minutes to their workflow.
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