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Thanks folks and especially Don P for that very complete review. I've been lurking in the background on this thread while I researched my first filter for visual observing with my 12" dob, and I checked out the cloudynights link and noticed this comment:
David K's review of the DGM NPB filter showed that he was getting better contrast consistently with this filter over the Lumicon UHC. He then goes on to say, "The DGM Optics NPB Filter is an excellent narrow-band nebula filter which I recommend that nearly every amateur have in their eyepiece box."
Good enough for me, I've bought one.
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