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Interesting question - I have the same camera and filters, but use the software X-calibrator to determine the balance between the colour channels. It's easy to use and freeware.
What I have noticed is that the results are not uniform - I usually get numbers around:R 0.85 G 0.8 and B 1, but these vary up to 10%. I think the exposure time and light pollution are fairly important variables too.
Cheers,
Andrew.
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