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Yep, I was told that it is more effective/efficient to use the inbuilt feature to remove noise. Essentially a dark is applied to the photo after every shot. The alternative is to take a set of darks at the end of the run of lights (or subs) - which is what you do with ICNR turned off. Taking the darks at the same temperature as the light frames (subs) is important - well critical.
So I take my series of lights with ICNR on. I take my flats - 10 or 12 of them. Then let the software do the combining. I use Deep Sky Stacker (DSS).
Damian, I would suggest that you maybe introducing noise by having ICNR on and then applying darks as well. Thats what happened with mine. So I stopped.
The Flats that I use are "light flats". The scope and camera are left the same as when I took the lights (subs). I then put a light box over the end and take the flat shots. I previously used a white t-shirt, then progressed to a cotton sheet. Now I have a box with some leds in it.
I believe you can take "dark flats" but I don't bother.
Darrell
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