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  1. Astrodon - Narrowband - 36mm Unmounted H-a 3 nm Filter

    Astrodon - Narrowband - 36mm Unmounted H-a 3 nm Filter

    Narrowband Filters      Narrowband (NB) filters  enhance contrast of emission objects by accepting only a narrow range of wavelengths around the emission lines of hydrogen (H-a, 656 nm), oxygen (OIII,

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    (48 States)
    Model#: HA3-36R
    $565.00

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