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80A Wratten 2 100mm 4" Gel Filter
Wratten number - Wikipedia
Technical
TPO #80A Medium Blue Filter & Case - 2" | OPT Telescopes
Filters for visual observing of the Moon and planets – British Astronomical Association
Kodak 3 x 3" 85C Wratten 2 Optical Filter 8027872 B&H Photo Video
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Kodak 3x3" (75mm) 80A Color Conversion Wratten 2 Optical 8812083
Astro Essentials 2" #80A Medium Blue Filter | First Light Optics
Photographic filter - Wikipedia
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