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Filters

11 Items
Astrodon 3 nm SII Narrowband 49.7 mm Round Filter

Astrodon 3 nm SII Narrowband Filter - 49.7 mm Round Unmounted - SII3-50R

SKU: ASD-SII3-50R
  • Filter Type: SII
  • Filter Size: 50 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$1,145.00
Baader SII 8nm Narrowband Filter - 50 mm Square

Baader S-II 8 nm Narrowband CCD Filter - 50 mm Square Unmounted - FSIIN-SQ50

SKU: BAD-FSIIN-SQ50
  • Filter Type: SII
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$360.00
Astronomik 50 mm Round SII 12 nm CCD Filter

Astronomik SII 12 nm CCD Filter - 50 mm Round - SII-50R

SKU: ASF-SII-50R
  • Filter Type: SII
  • Filter Size: 50 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$299.95
Astronomik 50 mm Round SII 6 nm CCD Filter

Astronomik SII 6 nm CCD Filter - 50 mm Round - SII6-50R

SKU: ASF-SII6-50R
  • Filter Type: SII
  • Filter Size: 50 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$469.95
Astronomik 50 mm x 50 mm SII 12 nm CCD Filter

Astronomik SII 12 nm CCD Filter - 50 mm Square - SII-50SQ

SKU: ASF-SII-50SQ
  • Filter Type: SII
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$329.95
Astronomik SII 6 nm CCD 50 mm Square Filter

Astronomik SII 6 nm CCD Filter - 50 mm Square - SII6-50SQ

SKU: ASF-SII6-50SQ
  • Filter Type: SII
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$499.95
Astrodon Narrowband Filters

Astrodon 3 nm SII Narrowband Filter - 49.7 mm Square Unmounted - SII3-50S

SKU: ASD-SII3-50S
  • Filter Type: SII
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$1,438.00
Astrodon Narrowband Filters

Astrodon 5 nm SII Narrowband Filter - 49.7 mm Round Unmounted - SII5-50R

SKU: ASD-SII5-50R
  • Filter Type: SII
  • Filter Size: 50 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$870.00
Astrodon Narrowband Filters

Astrodon 5 nm SII Narrowband Filter - 49.7 mm Square Unmounted - SII5-50S

SKU: ASD-SII5-50S
  • Filter Type: SII
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$1,024.00
Baader Planetarium Ultra Narrowband 4.5 nm SII CCD Filter - 50 mm Round

Baader Planetarium Ultra Narrowband 4.5 nm SII CCD Filter - 50 mm Round - FSIINU-RD50

SKU: BAD-FSIINU-RD50
  • Filter Type: SII
  • Filter Size: 50 mm
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$479.00
Baader 50 mm x 50 mm Ultra Narrowband 4.5 nm SII CCD Filter

Baader Planetarium Ultra Narrowband 4.5 nm SII CCD Filter - 50x50 mm Square - FSIINU-SQ50

SKU: BAD-FSIINU-SQ50
  • Filter Type: SII
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Threaded
Free shipping Free shipping
$567.00

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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