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  • Astrodon Narrowband Filters
    Astrodon Astrodon 3 nm H-Alpha Narrowband Filter - 31 mm Unthreaded Insert - HA3-31R
    $574.00
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  • Astrodon 31 mm Unthreaded 3 nm OIII Narrowband Filter
    Astrodon Astrodon 3 nm OIII Narrowband Filter - 31 mm Unthreaded Insert - OIII3-31R
    $574.00
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  • Astrodon 1.25
    Astrodon Astrodon Clear Filter with UV-Blocking Only - 31 mm Unthreaded Insert - C2-31R
    $183.00
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  • Astrodon 31 mm Unthreaded Luminance Filter with UV/NIR Blocking
    Astrodon Astrodon Luminance UV/NIR Blocking Filter - 31 mm Unthreaded Insert - L2-31R
    $194.00
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  • Astrodon Narrowband Filters
    Astrodon Astrodon 5 nm H-Alpha Narrowband Filter - 31 mm Unthreaded Insert - HA5-31R
    $390.00
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  • Astrodon SII 5 nm Narrowband Filter - 31 mm Unthreaded
    Astrodon Astrodon 5 nm SII Narrowband Filter - 31 mm Unthreaded Insert - SII5-31R
    $390.00
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  • Astrodon 31 mm Unthreaded OIII Narrowband Filter - 5 nm
    Astrodon Astrodon 5 nm OIII Narrowband Filter - 31 mm Unthreaded Insert - OIII5-31R
    $390.00
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  • Astrodon Narrowband Filters
    Astrodon Astrodon 5 nm Red Continuum Narrowband Filter - 31 mm Unthreaded Insert - REDCON5-31R
    $390.00
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  • Astrodon Narrowband Filters
    Astrodon Astrodon 3 nm SII Narrowband Filter - 31 mm Unthreaded Insert - SII3-31R
    $574.00
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  • Astrodon Narrowband Filters
    Astrodon Astrodon 3 nm NII Narrowband Filter - 31 mm Unthreaded Insert - NII3-31R
    $574.00
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  • Astrodon 31 mm Unthreaded E-Series Tru-Balance Red
    Astrodon Astrodon E-Series Tru-Balance Red Filter - 31 mm Unthreaded Insert - R2-E31R
    $194.00
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  • Astrodon 31 mm Unthreaded E-Series Tru-Balance Green
    Astrodon Astrodon E-Series Tru-Balance Green Filter - 31 mm Unthreaded Insert - G2-E31R
    $194.00
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  • Astrodon 31 mm Unthreaded E-Series Tru-Balance Blue
    Astrodon Astrodon E-Series Tru-Balance Blue Filter - 31 mm Unthreaded Insert - B2-E31R
    $194.00
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  • Astrodon Generation 2 E-Series 1.25
    Astrodon Astrodon I-Series Tru-Balance Red Filter - 31 mm Unthreaded Insert - R2-I31R
    $194.00
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  • Astrodon Generation 2 E-Series 1.25
    Astrodon Astrodon I-Series Tru-Balance Green Filter - 31 mm Unthreaded Insert - G2-I31R
    $194.00
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  • Astrodon 31 mm Unthreaded Tru-Balance Blue Filter
    Astrodon Astrodon I-Series Tru-Balance Blue Filter - 31 mm Unthreaded Insert - B2-I31R
    $194.00
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  • Astrodon UVenus UV Imaging Filter
    Astrodon Astrodon UVenus UV Imaging Filter - 31 mm Unthreaded Insert - UVENUS-31R
    $219.00
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  • Astrodon 31 mm Unthreaded Photometric Sloan U Filter
    Astrodon Astrodon Photometric Sloan Gen2 U Filter - 320/385 nm - 31 mm Unthreaded Insert - U2-31R
    $222.00
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  • Astrodon 31 mm Unthreaded Photometric Sloan G Filter
    Astrodon Astrodon Photometric Sloan Gen2 G Filter - 401/550 nm - 31 mm Unthreaded Insert - G2-31R
    $222.00
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  • Astrodon 31 mm Unthreaded Photometric Sloan R Filter
    Astrodon Astrodon Photometric Sloan Gen2 R Filter - 562/695 nm - 31 mm Unthreaded Insert - R2-31R
    $222.00
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  • Astrodon Edge-Blackened Sloan Generation 2 Filters with Transmission Chart
    Astrodon Astrodon Photometric Sloan Gen2 I Filter - 695/844 nm - 31 mm Unthreaded Insert - I2-31R
    $222.00
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  • Astrodon Edge-Blackened Sloan Generation 2 Filters
    Astrodon Astrodon Photometrics Sloan Gen2 Y Filter - 950/1058 nm - 31 mm Unthreaded Insert - Y2-31R
    $222.00
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  • Astrodon Edge-Blackened Sloan Generation 2 Filters
    Astrodon Astrodon Photometrics Sloan Gen2 Z Filter - >826 nm - 31 mm Unthreaded Insert - Z2-31R
    $222.00
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  • Astrodon Edge-Blackened Sloan Generation 2 Filters
    Astrodon Astrodon Photometrics Sloan Gen2 Z-S Filter - 826/920 nm - 31 mm Unthreaded Insert - Z-S2-31R
    $222.00
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  • Astrodon Johnson-Cousins UVBRI Photometric Filters
    Astrodon Astrodon Photometric Johnson-Cousins UV Filter - 31 mm Unthreaded Insert - UV-31R
    $226.00
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  • Astrodon 31 mm Unthreaded Photometric Johnson-Cousins B Filter
    Astrodon Astrodon Photometric Johnson-Cousins B Filter - 31 mm Unthreaded Insert - B-31R
    $226.00
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  • Astrodon Johnson-Cousins UVBRI Photometric Filters
    Astrodon Astrodon Photometric Johnson-Cousins V Filter - 31 mm Unthreaded Insert - V-31R
    $226.00
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  • Astrodon Johnson-Cousins UVBRI Photometric Filters
    Astrodon Astrodon Photometric Johnson-Cousins Rc Filter - 31 mm Unthreaded Insert - RC-31R
    $226.00
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  • Astrodon 31 mm Unthreaded Photometric Johnson-Cousins Ic Filter
    Astrodon Astrodon Photometric Johnson-Cousins Ic Filter - 31 mm Unthreaded Insert - IC-31R
    $226.00
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  • Astrodon ExoPlanet Light Curve Filter with Blue Blocking
    Astrodon Astrodon Exo-Planet Clear Filter with Blue Blocking - 31 mm Unmounted Insert - XOPBB-31R
    $195.00
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  • Baader Planetarium Baader Planetarium f/2 Highspeed Narrowband H-Alpha CCD Filter - 31mm Unmounted - FHALHS-RD31
    $209.00
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Your new telescope finally arrived- you opened the box and assembled the scope as carefully as you can. Once darkness falls, the first thing you do is point it up at the Moon and look into the eyepiece. Wow. But if you can imagine, the Moon actually can appear better than that when properly filtered. Telescopes have the ability to attach filters for many different purposes - some of the most common filters are for looking at the Moon, Planets, and Sun.


Eyepiece filters are an invaluable aid in lunar and planetary observing. They reduce glare and light scattering, increase contrast through selective filtration, increase definition and resolution, reduce irradiation and lessen eye fatigue. Different filters will act differently, highlighting a rainbow of wavelengths to enhance a variety of features in the night sky.


We offer deep sky filters and planetary filters from Lumicon, Baader Planetarium, Celestron, TeleVue, Meade, Orion, High Point & Thousand Oaks. Telescope filters will add to the performance of virtually any telescope and are a highly recommended telescope accessory. Feel free to contact one of our telescope experts for advice on selecting the filter assortment that is right for you.

High Point Scientific is rated 4.9/5 based on 1347 reviews

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