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Filters

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Baader Planetarium OIII 8.5 nm Narrowband Filter - 1.25" Mounted

Baader Planetarium OIII 8.5 nm Narrowband CCD Filter - 1.25" Mounted - FOIIIN-1

SKU: BAD-FOIIIN-1
  • Filter Type: OIII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
$149.00
 
Baader Planetarium 2" OIII 8.5 nm Narrowband Filter

Baader OIII 8.5 nm Narrowband CCD Filter - 2" Mounted - FOIIIN-2

SKU: BAD-FOIIIN-2
  • Filter Type: OIII
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$227.00
 

Orion X-tra Narrowband Oxygen Three O-III 1.25" Filter - 5578

SKU: ORI-05578
  • Filter Type: OIII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
$129.99 $103.99
 

Optolong OIII 25nm Filter - 1.25" Mounted - OIII-125

SKU: OTL-OIII-125
  • Filter Type: OIII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$78.00
 

Optolong 25nm OIII Filter - 2" Mounted - OIII-200

SKU: OTL-OIII-200
  • Filter Type: OIII
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$108.00
 

Optolong OIII CCD 6.5nm Filter - 1.25" Mounted - OIIICCD65-125

SKU: OTL-OIIICCD65-125
  • Filter Type: OIII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$159.00
 

Optolong OIII CCD 6.5nm Filter - 2" Mounted - OIIICCD65-200

SKU: OTL-OIIICCD65-200
  • Filter Type: OIII
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$255.00
 

Optolong OIII CCD 6.5nm Filter - 31mm Unmounted - OIIICCD65-31U

SKU: OTL-OIIICCD65-31U
  • Filter Type: OIII
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$189.00
 

Optolong OIII CCD 6.5nm Filter - 36mm Unmounted - OIIICCD65-36U

SKU: OTL-OIIICCD65-36U
  • Filter Type: OIII
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$195.00
 
Astrodon OIII 3 nm Narrowband Filter - 36 mm Unthreaded Insert

Astrodon 3 nm OIII Narrowband Filter - 36 mm Round - OIII3-36R

SKU: ASD-OIII3-36R
  • Filter Type: OIII
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$748.00
 
Astrodon 3 nm OIII Narrowband Filter - 50 mm Round

Astrodon 3 nm OIII Narrowband Filter - 49.7 mm Round Unmounted - OIII3-50R

SKU: ASD-OIII3-50R
  • Filter Type: OIII
  • Filter Size: 50 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$1,145.00
 

Astrodon 3 nm OIII Narrowband Filter - 65 mm Square Unmounted - OIII3-65S

SKU: ASD-OIII3-65S
  • Filter Type: OIII
  • Filter Size: 65 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$2,495.00
 

Astrodon 5 nm OIII Narrowband Filter - 36 mm Round Unmounted - OIII5-36R

SKU: ASD-OIII5-36R
  • Filter Type: OIII
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$501.00
 
Astronomik OIII 12 nm CCD Filter - 2" Round Mounted

Astronomik OIII 12 nm CCD Filter - 2" Round Mounted - OIIICCD-2

SKU: ASF-OIIICCD-2
  • Filter Type: OIII
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$289.95
 
Astronomik OIII 12 nm CCD Filter - 1.25" Round Mounted

Astronomik OIII 12 nm CCD Filter - 1.25" Round Mounted - OIIICCD-1

SKU: ASF-OIIICCD-1
  • Filter Type: OIII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$129.95
 
Astronomik 12 nm OIII CCD Filter - EOS Clip

Astronomik OIII 12 nm CCD Filter - EOS Clip - OIIICCD-EOS

SKU: ASF-OIIICCD-EOS
  • Filter Type: OIII
  • Filter Size: EOS APS Clip
  • Filter Shape: EOS Clip
  • Filter Insert Style: Clip-In
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$189.95
 
Baader OIII High Speed f/2 CCD Filter

Baader f/2 High Speed OIII CCD Filter - 1.25" Mounted - FOIIIHS-1

SKU: BAD-FOIIIHS-1
  • Filter Type: OIII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$213.00
 
Baader OIII High Speed f/2 CCD Filter

Baader f/2 High Speed OIII CCD Filter - 2" Mounted - FOIIIHS-2

SKU: BAD-FOIIIHS-2
  • Filter Type: OIII
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$329.00
 
Baader OIII 8.5 nm Filter - 36 mm Unmounted

Baader OIII 8.5 nm Narrowband CCD Filter - 36 mm Unmounted - FOIIIN-RD36

SKU: BAD-FOIIIN-RD36
  • Filter Type: OIII
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$182.00
 
Baader OIII 8.5 nm Filter - 36 mm Unmounted

Baader OIII 8.5 nm Narrowband CCD Filter - 50.4 mm Round Unmounted - FOIIIN-RD50

SKU: BAD-FOIIIN-RD50
  • Filter Type: OIII
  • Filter Size: 50.4 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$292.00
 
Baader OIII 8.5 nm Filter - 50 mm Square Unmounted

Baader OIII 8.5 nm Narrowband CCD Filter - 50 mm Square Unmounted - FOIIIN-SQ50

SKU: BAD-FOIIIN-SQ50
  • Filter Type: OIII
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$374.00
 
Baader OIII 8.5 nm Filter - 65 mm Square Unmounted

Baader OIII 8.5 nm Narrowband CCD Filter - 65 mm Square Unmounted - FOIIIN-SQ65

SKU: BAD-FOIIIN-SQ65
  • Filter Type: OIII
  • Filter Size: 65 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$492.00
 
Explore Scientific 1.25" OIII Nebula Filter with Case

Explore Scientific 1.25" OIII Nebula Filter - 310205

SKU: EXS-310205
  • Filter Type: OIII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
$99.99 $71.99
 
Explore Scientific 2" OIII Nebula Filter with Case

Explore Scientific 2" OIII Nebula Filter - 310200

SKU: EXS-310200
  • Filter Type: OIII
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
$129.99
 

ZWO OIII 7nm Filter - 1.25" - OIII125

SKU: ZWO-OIII125
  • Filter Type: OIII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$129.00
 

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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