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  • Optolong Optolong SII CCD 12nm Filter - 1.25" Mounted - SIICCD12-125
    $129.00 $103.20
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  • Optolong Optolong SII CCD 6.5nm Filter - 1.25" Mounted - SIICCD65-125
    $159.00
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  • Optolong Optolong SII CCD 6.5nm Filter - 2" Mounted - SIICCD65-200
    $250.00
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  • Optolong SII Unmounted Filter
    Optolong Optolong SII CCD 12nm Filter - 31mm Unmounted - SIICCD12-31U
    $153.00 $125.00
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  • Optolong SII Unmounted Filter
    Optolong Optolong SII CCD 12nm Filter - 36mm Unmounted - SIICCD12-36U
    $159.00 $127.00
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  • Optolong SII Unmounted Filter
    Optolong Optolong SII CCD 6.5nm Filter - 31mm Unmounted - SIICCD65-31U
    $193.00
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  • Optolong SII Unmounted Filter
    Optolong Optolong SII CCD 6.5nm Filter - 36mm Unmounted - SIICCD65-36U
    $199.00
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  • Baader Planetarium 2
    Baader Planetarium Baader S-II 8 nm Narrowband CCD Filter - 2" Mounted - FSIIN-2
    $234.00
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  • Astronomik 12 nm SII CCD Filter - 1.25
    Astronomik Filters Astronomik SII 12 nm CCD Filter - 1.25" - SII-1
    $129.95
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  • Astronomik 2
    Astronomik Filters Astronomik SII 12 nm CCD Filter - 2" - SII-2
    $289.95
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  • Baader SII 8nm Narrowband Filter - 36 mm Round
    Baader Planetarium Baader S-II 8 nm Narrowband CCD Filter - 36 mm Unmounted - FSIIN-RD36
    $188.00
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  • Baader SII 8nm Narrowband Filter - 50.4 mm Round
    Baader Planetarium Baader S-II 8 nm Narrowband CCD Filter - 50.4 mm Unmounted - FSIIN-RD50
    $299.00
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  • Baader SII 8nm Narrowband Filter - 50 mm Square
    Baader Planetarium Baader S-II 8 nm Narrowband CCD Filter - 50 mm Square Unmounted - FSIIN-SQ50
    $360.00
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  • Baader SII 8nm Narrowband Filter - 65 mm Square
    Baader Planetarium Baader S-II 8 nm Narrowband CCD Filter - 65 mm Square Unmounted - FSIIN-SQ65
    $479.00
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  • Baader SII High Speed f/2 CCD Filter
    Baader Planetarium Baader f/2 High Speed SII CCD Filter - 1.25" Mounted - FSIIHS-1
    $219.00
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  • Baader SII High Speed f/2 CCD Filter
    Baader Planetarium Baader f/2 High Speed SII CCD Filter - 2" Mounted - FSIIHS-2
    $352.00
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  • Astronomik 31 mm Round SII 12 nm CCD Filter
    Astronomik Filters Astronomik SII 12 nm CCD Filter - 31 mm - SII-31
    $169.95
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  • Astronomik 1.25
    Astronomik Filters Astronomik SII 6 nm CCD Filter - 1.25" - SII6-1
    $199.95
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  • Astronomik SII 6 nm CCD EOS Clip Filter
    Astronomik Filters Astronomik SII 6 nm CCD EOS Clip Filter - SII6-EOS
    $289.95
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  • Astronomik SII 12 nm CCD Filter for Canon EOS Cameras
    Astronomik Filters Astronomik SII 12 nm CCD EOS Clip Filter - SII-EOS
    $189.95
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  • Astronomik SII 12 nm CCD Filter - 36 mm Round
    Astronomik Filters Astronomik SII 12 nm CCD Filter - 36 mm - SII-36
    $189.95
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  • Astronomik 50 mm Round SII 12 nm CCD Filter
    Astronomik Filters Astronomik SII 12 nm CCD Filter - 50 mm Round - SII-50R
    $299.95
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  • Astronomik SII 12 nm CCD Filter - SC Rear Cell
    Astronomik Filters Astronomik SII 12 nm CCD Filter - SCT Rear Cell - SII-SCT
    $289.95
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  • Astronomik SII 12 nm CCD Clip Filter - EOS XL Full Frame
    Astronomik Filters Astronomik SII 12 nm CCD EOS XL Full Frame Clip Filter - SII-EOSXL
    $319.95
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  • Astronomik 2
    Astronomik Filters Astronomik SII 6 nm CCD Filter - 2" - SII6-2
    $469.95
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  • Astronomik 31 mm Round SII 6 nm CCD Filter
    Astronomik Filters Astronomik SII 6 nm CCD Filter - 31 mm - SII6-31
    $249.95
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  • Astronomik SII 6 nm CCD Filter - 36 mm Round
    Astronomik Filters Astronomik SII 6 nm CCD Filter - 36 mm - SII6-36
    $289.95
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  • Astronomik 50 mm Round SII 6 nm CCD Filter
    Astronomik Filters Astronomik SII 6 nm CCD Filter - 50 mm Round - SII6-50R
    $469.95
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  • Astronomik SII 6 nm T-Mount CCD Filter
    Astronomik Filters Astronomik SII 6 nm CCD Filter - T-Mount - SII6-T
    $419.95
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  • Astronomik SII 6 nm CCD EOS XL Full Frame Clip Filter
    Astronomik Filters Astronomik SII 6 nm CCD EOS XL Full Frame Clip Filter - SII6-EOSXL
    $489.95
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  • Astronomik 50 mm x 50 mm SII 12 nm CCD Filter
    Astronomik Filters Astronomik SII 12 nm CCD Filter - 50 mm Square - SII-50SQ
    $329.95
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  • Astronomik SII 6 nm CCD 50 mm Square Filter
    Astronomik Filters Astronomik SII 6 nm CCD Filter - 50 mm Square - SII6-50SQ
    $499.95
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  • Astronomik SII 12 nm CCD T-Mount Filter
    Astronomik Filters Astronomik SII 12 nm CCD Filter - T-Mount - SII-T
    $269.95
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  • Astrodon Narrowband Filters
    Astrodon Astrodon 5 nm SII Narrowband Filter - 49.7 mm Round Unmounted - SII5-50R
    $870.00
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  • Astrodon Narrowband Filters
    Astrodon Astrodon 5 nm SII Narrowband Filter - 49.7 mm Square Unmounted - SII5-50S
    $1,024.00
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  • Astronomik SII 12 nm CCD Filter - EOS-M Clip
    Astronomik Filters Astronomik SII 12 nm CCD EOS M Clip Filter - SII-EOS-M
    $209.95
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  • Astronomik SII 12 nm CCD Clip Filter for Sony Alpha 7 Series Cameras
    Astronomik Filters Astronomik SII 12 nm CCD Sony Alpha 7 Clip Filter - SII-SONY
    $329.95
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  • Astronomik SII 6 nm CCD Filter - SC Rear Cell
    Astronomik Filters Astronomik SII 6 nm CCD Filter - SC Rear Cell - SII6-SCT
    $479.95
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  • Astronomik 27 mm Round 12 nm SII CCD Filter
    Astronomik Filters Astronomik SII 12 nm CCD Filter - 27 mm Round - SII-27
    $129.95
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  • Astronomik 27 mm Round SII 6 nm CCD Filter
    Astronomik Filters Astronomik SII 6 nm CCD Filter - 27 mm Round - SII6-27
    $199.95
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One of the most crucial accessories of astro-imaging is filters. 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.


Deep-space imaging in particular benefits from filters. Far away celestial objects, such as nebulae come to life in your photos with vivid colors. We recommend starting out with an h-alpha filter to filter out broadband light pollution while only allowing a very narrow bandwidth of light to pass through. These are a favorite filter among astrophotographers!


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.

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