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I found the best results with my 30D modded with a clear filter was with a manual white balance using a white (or grey) sheet of paper under daylight.
AND a UV/IR blocking filter such as the Baader, otherwise you just get way too much UV and in particular IR coming through.
If you want a 'normal' looking photo, you want the h-alpha coming through and visible wavelengths, but not the UV or IR - unless you want them of course!
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