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The quality of light used for a flat field certainly seems to affect one shot colour. I took a series of flats today with a blue sky lighting through white cartrige paper and the results are noticably different from flats taken with an overcast sky as the light source.
I think it is time to consider building a light box. Jerry Lodregus seems to think LEDs are not a good idea, but doesn't seem to say why.
I used to service a certain negative film scanner that used arrays of red, green and blue LEDs to illuminate the negs. quite impressive display of colour as it flashed thru the colours, varying time intervals to give a white balanced exposure.
Of course in that application there was no need to try to produce white light, as the beastie just read the three channels and went away and did its homework. Still, I wonder if a Light box could be worked with a set of LEDs tuned to give white light?
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