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I dont know if the G2V method is the best, its probably not, but then again its probably OK too?
Take your test RGB exposures on a G2V star at the zenith, then there are no extinction factors to think about. Calculate your weights based on the adu readings. When you take your image, compensate for the atmospheric extinction factors for each filter from the table, multiply by those factors as per the article. Then there is just a loss of general light reaching the scope when you get low in the horizon that you may want to compensate for, mentioned last in this article.
Josh
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