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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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Optolong Telescopes H-alpha 7nm Clip Filter Built-in Aps-c For Eos-c 80d/800d/70d/750d/700d/600d Camera Deepsky Astrophotography - Telescope - AliExpress
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Amazon.com : SVBONY Telescope Filter H-Alpha 7nm 2 inches Filter Narrowband Astronomical Photographic CCD Filter Color Filter Set for Deep Sky Photography : Electronics
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