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Could someone please explain the physics of how a flat with a colour cast, subsequently converted to mono, is going to affect the processing of light frames?
The flats are designed for proportional correction of dust and other optical abberations. I can't see how vignetting correction could be affected (albeit at extremely low levels in relation to refraction/diffraction differences for visible wavelengths). I guess if you had coloured dust bunnies you might get into strife? (I haven't seen a good dust bunny yet on the Newt though).
I knew I should have posted a resized master flat in monochrome......
(that Matty knows what he's doing!)
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