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The DGM NPB is a fine filter...I have it and like it.
If you have not yet read the filter article by David Knisely (spelling?) posted on Cloudy Nights I would encourage you to. He did a comprehensive assesement and the DGM fared well...
Are you thinking that you want the 2 inch filter or the 1.25 inch filter? (Which eyepieces do you want to use it with?)
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