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OK, I tracked it down. The reasoning given for using "daylight" white balance was that auto was resulting in an image that was too blue in earlier Canon DSLRs. Additionally, with a modified camera it results in an image that is too red.
Current recommended procedure is to calibrate your white balance to a G2 type star, or custom calibrate your camera using an image of a white card shot in unfiltered sunlight. The ImagesPlus yahoo group has a lot of useful information on this subject, but you will need to subscribe to the group (free) in order to read the archives.
Regards,
Eric
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