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  1. Astro-Tech Ultra High Contrast (UHC) narrowband for 1.25" eyepieces

    $49.95
    This Astro-Tech UHC 1.25" narrowband filter is designed for visually observing emission nebulas from heavily light-polluted areas. The filter has excellent transmission at the visually important emission lines of hydrogen-beta at 4861Å and doubly ionized oxygen at 4959Å and 5007Å. 
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