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31mm Filters

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  1. Astronomik 6 nm OIII MFR Narrowband Filter - 31 mm Mounted

    Astronomik - 6nm OIII MFR Narrowband Filter - 31mm Mounted

    The OIII line (501 nm) is located in the blue-green portion of the spectrum, making them very suitable for observing most planetary nebulae and supernovae remnants and other objects with doubly ionized oxygen.

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    (48 States)
    Model#: OIIICCD6-31
    $249.95

  2. Astronomik - OIII 12nm CCD Filter - 31mm Round Unmounted

    Astronomik - OIII 12nm CCD Filter - 31mm Round Unmounted

    The Astronomik OIII CCD filter is a narrow band emission-line-filter for CCD photography.

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    Model#: OIIICCD-31
    $169.95

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