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I have been using a white cartridge paper over the dew cap with the OT aimed at the zenith. Colour balance on the calibrated image is done using a G2V star. I think this should compensate for any white imbalance in the paper.
Eddie's light box has some attractive advantages over a sky flat. Not sure how white a low level light source is, however a G2V star balancing act should take care of any colour bias introduced by the flat field image in the final calibrated image.
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