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Let our non-commissioned product advisors help you select the best filter to achieve your observation goals! Whether you need filters for astrophotography or visual use we'll help you find the perfect filter to complement your equipment.


Bring out as much detail as possible in your celestial targets with OIII, ultra high contrast, and hydrogen filters perfect for astrophotography. Or get more details on planets with neutral density, Skyglow, Longpass and color filters. We offer high-quality deep sky and planetary filters from manufacturers like Lumicon, Baader Planetarium, Celestron, TeleVue, Meade, Orion, High Point & Thousand Oaks.

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  • Baader Planetarium SII 8 nm Narrowband CCD Filter - 1.25
    Baader Planetarium Baader S-II 8 nm Narrowband CCD Filter - 1.25" Mounted - FSIIN-1
    $149.00
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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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  • 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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  • 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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