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G'day John and Gerald, Not too sure of the reason or benefit in rotating the camera.
That alerted me to the effect colour has on the final image was that like you, I took some sky flats using a mid afternoon blue sky, then G2V calibrated my S/W. I needed to take a new set of flats, but did nor wait for a clear blue sky: I collected data from an overcast sky instead. When I applied these flats to their intended light frames, the colour balance was all screwy. Colour returned to normal if I used the older flats, though naturally enough these no longer effectively flattened the image or removed dust motes.
Gerald, when you say "The Masterflat gets anyhow monochrome ", are you referring to the fact that you are applying the flats before colour conversion, or are you converting the flats to monochrome, ie. removing the Bayer matrix coded data? Sorry, just not sure of what you mean.
cheers,
Doug
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