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Thanks Glenn. I was blown away by the low background level and even more so - the lower noise associated with it.
I didn't do any color balancing. The filter lets through HO and the O hits G+B on the Bayer matrix, so looks like enough to maintain star colors. But I have to check what colors the stars in this image are actually supposed to be.
I'm doing tarantula and ngc3324 tonight to see what something with more Halpha looks like.
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