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Yes, it came out green instead of the red nebulosity all over! So much for custom white balance. Maybe I need a new CWB with the filter included... easy enough to do.
That mark is one of several. Its gotta be dust... I haven't had a subject where the flats haven't removed the dust doughnuts so it was a new one for me. Maybe the moonlight angle of attack being different from that of the lightbox caused that...some sort of interference pattern.
Always something new!
GlennB
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