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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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  • Lumicon Lumicon Gen 3 OIII Oxygen III Filter - 2" - LF3045
    $200.00
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  • Thousand Oaks Optical Thousand Oaks LP-3 Oxygen III Nebula Filter - 2" - LP-348
    $179.00
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    free shipping
  • Baader Planetarium 1.25
    Baader Planetarium Baader Visual OIII Nebula Filter - 1.25" - FOIII-1
    $109.00
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  • Baader Planetarium 2
    Baader Planetarium Baader Visual OIII Nebula Filter - 2" - FOIII-2
    $189.00
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  • Celestron OIII Narrowband Filter - 1.25
    Celestron Celestron Oxygen III (OIII) Narrowband 1.25" Filter - 93623
    $89.95 $75.95
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  • Celestron Celestron Oxygen III (OIII) Narrowband 2" Filter - 93624
    $119.95 $99.95
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  • Lumicon 1.25
    Lumicon Lumicon Gen 3 OIII Oxygen III Filter - 1.25" - LF3040
    $100.00
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    free shipping
  • Lumicon Lumicon Oxygen III (OIII) Thread-on Filter for Schmidt-Cassegrain Rear Cell - LF3050
    $200.00
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    free shipping
  • Orion Orion Oxygen III Nebula 1.25" Filter - 05581
    $99.99
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  • Orion Orion Oxygen III Nebula 2" Filter - 05582
    $129.99
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  • Orion Orion X-tra Narrowband Oxygen Three O-III 1.25" Filter - 5578
    $129.99 $103.99
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  • Thousand Oaks Optical Thousand Oaks LP-3 Nebula Filter Oxygen III - 1.25" - LP-325
    $89.00
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  • Baader Planetarium OIII 8.5 nm Narrowband Filter - 1.25
    Baader Planetarium Baader Planetarium OIII 8.5 nm Narrowband CCD Filter - 1.25" Mounted - FOIIIN-1
    $149.00
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  • Baader Planetarium 2
    Baader Planetarium Baader OIII 8.5 nm Narrowband CCD Filter - 2" Mounted - FOIIIN-2
    $227.00
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    free shipping
  • Astronomik 1.25
    Astronomik Filters Astronomik OIII Visual Filter - 1.25" Round Mounted - OIII-1
    $109.95
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  • Astronomik OIII 12 nm CCD Filter - 2
    Astronomik Filters Astronomik OIII 12 nm CCD Filter - 2" Round Mounted - OIIICCD-2
    $289.95
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  • Astronomik 2
    Astronomik Filters Astronomik OIII Visual Filter - 2" Round Mounted - OIII-2
    $219.95
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  • Astronomik OIII 12 nm CCD Filter - 1.25
    Astronomik Filters Astronomik OIII 12 nm CCD Filter - 1.25" Round Mounted - OIIICCD-1
    $129.95
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  • Astronomik 12 nm OIII CCD Filter - EOS Clip
    Astronomik Filters Astronomik OIII 12 nm CCD Filter - EOS Clip - OIIICCD-EOS
    $189.95
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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 OIII 8.5 nm Filter - 50 mm Round Unmounted
    Baader Planetarium Baader OIII 8.5 nm Narrowband CCD Filter - 50.4 mm Round Unmounted - FOIIIN-RD50
    $292.00
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  • Baader OIII 8.5 nm Filter - 50 mm Square Unmounted
    Baader Planetarium Baader OIII 8.5 nm Narrowband CCD Filter - 50 mm Square Unmounted - FOIIIN-SQ50
    $374.00
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  • Baader OIII 8.5 nm Filter - 65 mm Square Unmounted
    Baader Planetarium Baader OIII 8.5 nm Narrowband CCD Filter - 65 mm Square Unmounted - FOIIIN-SQ65
    $492.00
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  • Baader OIII High Speed f/2 CCD Filter
    Baader Planetarium Baader f/2 High Speed OIII CCD Filter - 1.25" Mounted - FOIIIHS-1
    $213.00
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  • Baader OIII High Speed f/2 CCD Filter
    Baader Planetarium Baader f/2 High Speed OIII CCD Filter - 2" Mounted - FOIIIHS-2
    $329.00
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  • Optolong Optolong OIII 25nm Filter - 1.25" Mounted - OIII-125
    $78.00
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    free shipping
  • Optolong Optolong 25nm OIII Filter - 2" Mounted - OIII-200
    $108.00
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    free shipping
  • Optolong Optolong OIII CCD 6.5nm Filter - 1.25" Mounted - OIIICCD65-125
    $159.00
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    free shipping
  • Optolong Optolong OIII CCD 6.5nm Filter - 2" Mounted - OIIICCD65-200
    $255.00
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  • Optolong Optolong OIII CCD 6.5nm Filter - 31mm Unmounted - OIIICCD65-31U
    $189.00
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  • Optolong Optolong OIII CCD 6.5nm Filter - 36mm Unmounted - OIIICCD65-36U
    $195.00
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  • Explore Scientific 1.25
    Explore Scientific Explore Scientific 1.25" OIII Nebula Filter - 310205
    $89.99 $71.99
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  • Explore Scientific 2
    Explore Scientific Explore Scientific 2" OIII Nebula Filter - 310200
    $119.99
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  • Astronomik OIII 12 nm CCD Filter - 31 mm Round
    Astronomik Filters Astronomik OIII 12 nm CCD Filter - 31 mm Round - OIIICCD-31
    $169.95
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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 OIII 12 nm CCD Filter - 50 mm Round
    Astronomik Filters Astronomik OIII 12 nm CCD Filter - 50 mm Round - OIIICCD-50R
    $299.95
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  • Astronomik 6 nm OIIICCD Filter - 1.25
    Astronomik Filters Astronomik OIII 6 nm CCD Filter - 1.25" Round Mounted - OIIICCD6-1
    $199.95
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  • Astronomik 2
    Astronomik Filters Astronomik OIII 6 nm CCD Filter - 2" Round Mounted - OIIICCD6-2
    $469.95
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  • Astronomik OIII 6 nm CCD Filter - 31 mm Round
    Astronomik Filters Astronomik OIII 6 nm CCD Filter - 31 mm Round - OIIICCD6-31
    $249.95
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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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