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That worked fine, thank you very much Clayton! Learning that RGB align can't compensate completely for atmospheric dispersion helps me a lot too. I determined that AD has affected the blue component of my Saturn image to such an extent that it can't be fixed with RGB align. I found an AD corrector for about 550 US dollars (500 Australian) so that is pretty steep however I still might consider it since my "observatory" is my condo balcony which limits all observations to less than 39 degrees elevation. Thanks again!
Peter
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