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Yes I tend to agree. Except for the fact of 1x1 binning usually on luminance and 2x2 on rgb. So perhaps you can get away with 2 only.
Its a trial and error thing. And as you say it assumes your filters are clean.
I think I'll give sky flats a go.
Not 100% sure of the best way to take them. How do you get rid of the stars for example. Dither heavily and median combine 10 or more?
The advantage I see of sky flats is it a closer duplication of what occurs when you take your exposure.
Greg.
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