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Baader H-alpha-7nm Sii-8nm O-iii 8.5nm Ccd Narrowband-filter 1¼" (combination) - Telescope & Binoculars - AliExpress
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Amazon.com : SVBONY Telescope Filter H-Alpha 7nm 1.25 inches Filter Narrowband Astronomical Photographic CCD Filter for Deep Sky : Electronics
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