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I use a clip in STC Astro-Multispectra from Cyclops Optics. very happy with its ability to kill light pollution. Seems many of these filters are available in multiple options (1.25", 2", canon/nikon clip ins). I haven't used any others to compare, but havent seen any complaints about this one. I only wanted one filter to help me get the most from my camera and this was the best i could find and nikon clipin is rare.
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