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I think you would be better off spending the time using 2 totally different filters like Ha + OII or SII. It would give you more information about the object you are imaging.
However if you have both the 6nm & 12nm filters already, then it wouldn't hurt to do a test sometime to see if you can detected any difference in performance, especially if you have a very fast scope. Also checking for reflections etc and see which one you like best.
James
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