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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 36 mm LRGBC Filter Set
    Baader Planetarium Baader LRGBC CCD Filter Set - 36 mm Unmounted - FLRGBC-RD36
    $524.00
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  • Baader 36 mm Round LRGB Filter Set
    Baader Planetarium Baader LRGB CCD Filter Set - 36 mm Round Unmounted - FLRGB-RD36
    $477.00
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    free shipping
  • 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 OIII 8.5 nm Filter - 36 mm Unmounted
    Baader Planetarium Baader OIII 8.5 nm Narrowband CCD Filter - 36 mm Unmounted - FOIIIN-RD36
    $182.00
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  • Baader 36 mm H-alpha 7 nm Narrowband Filter
    Baader Planetarium Baader H-Alpha 7 nm Narrowband CCD Filter - 36 mm Unmounted - FHALN-RD36
    $195.00
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  • Baader Clear IR-Blocked Filter - 36 mm Round Unmounted
    Baader Planetarium Baader Clear (C) IR-Blocked Focusing Filter - 36 mm Unmounted
    $64.00
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  • Optolong Optolong OIII CCD 6.5nm Filter - 36mm Unmounted - OIIICCD65-36U
    $195.00
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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 - 36mm Unmounted - SIICCD65-36U
    $199.00
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  • Optolong H-Alpha Unmounted Filter
    Optolong Optolong H-Alpha 7nm CCD Filter - 36mm Unmounted - HAL7-36U
    $193.00
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    free shipping
  • Optolong Optolong LRGB CCD Filter Set - 36mm Unmounted - LRGB-36U
    $299.00
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  • Optolong UVIR Cut Unmounted Filter
    Optolong Optolong UV-IR Cut Filter - 36mm Unmounted - UVIR-36U
    $56.00
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  • ZWO Astronomy Cameras ZWO LRGB Filter Set - 36mm Unmounted - LRGB-36
    $199.00
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  • Astronomik 36 mm CLS-CCD Light Pollution Filter
    Astronomik Filters Astronomik CLS CCD Light Pollution Filter - 36 mm Round - CLSCCD-36
    $129.95
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  • Astronomik 36 mm Round MC Clear Filter
    Astronomik Filters Astronomik MC Clear Glass Filter - 36 mm Round - C-36
    $59.95
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  • ZWO Astronomy Cameras ZWO H-Alpha 7nm CCD Filter - 36mm - HA36
    $169.00
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    free shipping
  • ZWO Astronomy Cameras ZWO SII 7nm Filter - 36mm - SII36
    $169.00
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    free shipping
  • ZWO Astronomy Cameras ZWO OIII 7nm Filter - 36mm - OIII36
    $169.00
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    free shipping
  • ZWO Astronomy Cameras ZWO 36mm Narrowband Filter Set - OIII, Ha, SII - NBSET-36
    $479.00
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    free shipping
  • Astronomik 36 mm CLS Light Pollution Filter
    Astronomik Filters Astronomik CLS Light Pollution Filter - 36 mm Round - CLS-36
    $109.95
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  • Astronomik 36 mm Round H-Alpha 12 nm CCD Filter
    Astronomik Filters Astronomik H-Alpha 12 nm CCD Filter - 36 mm Round - HA12-36
    $189.95
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  • Astronomik 6 nm H-Alpha Filter in 36 mm Format
    Astronomik Filters Astronomik H-Alpha 6 nm CCD Filter - 36 mm Round - HA6-36
    $289.95
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  • Astronomik LRGB Filter Set - 36 mm Round
    Astronomik Filters Astronomik LRGB Filter Set - 36 mm Round - LRGB-36
    $379.95
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  • Astronomik 36 mm Round UHC Filter
    Astronomik Filters Astronomik UHC Filter - 36 mm Round - UHC-36
    $129.95
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  • Astronomik 12 nm O-III CCD Filter - 36 mm Round
    Astronomik Filters Astronomik OIII 12 nm CCD Filter - 36 mm Round - OIIICCD-36
    $189.95
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  • Astronomik 36 mm Round OIII 6 nm CCD Filter
    Astronomik Filters Astronomik OIII 6 nm CCD Filter - 36 mm Round - OIIICCD6-36
    $289.95
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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 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 Deep Sky RGB Color Filter Set - 36 mm Round
    Astronomik Filters Astronomik Deep Sky RGB Color Filter Set - 36 mm Round - DRGB-36
    $379.95
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  • Astronomik 36 mm Round L-1 UV-IR Blocking Luminance Filter
    Astronomik Filters Astronomik L-1 UV-IR Blocking Filter - 36 mm Round - L1-36
    $89.95
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  • Astronomik 36 mm Round L-2 UV-IR Blocker
    Astronomik Filters Astronomik L-2 UV-IR Blocking Filter - 36 mm Round - L2-36
    $79.95
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  • Astronomik L-3 Luminance UV-IR Blocking Filter - 36 mm Round
    Astronomik Filters Astronomik L-3 UV-IR Blocking Filter - 36 mm Round - L3-36
    $89.95
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  • Astronomik ProPlanet 642 IR-Pass Filter - 36 mm Round
    Astronomik Filters Astronomik ProPlanet 642 IR Pass Filter - 36 mm Round - P642-36
    $89.95
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  • Astronomik 36 mm Round ProPlanet 742 IR Pass Filter
    Astronomik Filters Astronomik ProPlanet 742 IR Pass Filter - 36 mm Round - P742-36
    $69.95
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  • Astronomik 36 mm Round ProPlanet 807 IR-Pass Filter
    Astronomik Filters Astronomik ProPlanet 807 IR Pass Filter - 36 mm Round - P807-36
    $69.95
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  • Optolong Optolong 36mm Unmounted Filter Set with LRGB, H-Alpha, SII, and OIII Filters - LRGB-HASIIOIII-36U
    $775.00
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  • Optolong Optolong 36mm Unmounted LRGB and 7nm H-Alpha Filter Set - LRGB-HA-36U
    $465.00
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  • Optolong Optolong 36mm Unmounted Filter Set with H-Alpha, SII, and OIII Filters - HASIIOIII-36U
    $557.00
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  • Astrodon 36 mm Round Unmounted Luminance Gen2 UV/NIR Block Filter
    Astrodon Astrodon Luminance Gen2 UV/NIR Blocking Filter - 36 mm Round Unmounted - L2-36R
    $242.00
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  • Astrodon 36 mm Round Unmounted Gen2 I-Series LRGB Tru-Balance Filters
    Astrodon Astrodon Gen2 I-Series LRGB Tru-Balance Filter Set - 36 mm Round Unmounted - LRGB2-I36R
    $790.00
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