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Originally Posted by iceman
I've recently purchased the DGM Optics NPR filter (narrowband). I haven't done any conclusive tests yet, but we gave it a brief comparison (on only 2 objects, it was brief!) last time up at Kulnura against an Astronomik OIII and a Celestron one (Louie's).
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Mike,
That wasn't the Astronomik OIII it was the Astronomik UHC.
CS-John B