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Filters

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Astrodon Narrowband Filters

Astrodon 3 nm NII Narrowband Filter - 49.7 mm Square Unmounted - NII3-50S

SKU: ASD-NII3-50S
  • Filter Type: NII
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$1,438.00
Astrodon Narrowband Filters

Astrodon 3 nm H-Alpha Narrowband Filter - 49.7 mm Square Unmounted - HA3-50S

SKU: ASD-HA3-50S
  • Filter Type: H-Alpha
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$1,438.00
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 3 nm OIII Narrowband Filter - 49.7 mm Square Unmounted - OIII3-50S

SKU: ASD-OIII3-50S
  • Filter Type: OIII
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$1,438.00
Astrodon Johnson-Cousins UVBRI Photometric Filters

Astrodon Photometric Johnson-Cousins UV Filter - 49.7 mm Round Unmounted - UV-50R

SKU: ASD-UV-50R
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 50 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$500.00
Astrodon Johnson-Cousins UVBRI Photometric Filters

Astrodon Photometric Johnson-Cousins B Filter - 49.7 mm Round Unmounted - B-50R

SKU: ASD-B-50R
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 50 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$500.00
Astrodon Johnson-Cousins UVBRI Photometric Filters

Astrodon Photometric Johnson-Cousins V Filter - 49.7 mm Round Unmounted - V-50R

SKU: ASD-V-50R
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 50 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$500.00
Astrodon Johnson-Cousins UVBRI Photometric Filters

Astrodon Photometric Johnson-Cousins Rc Filter - 49.7 mm Round Unmounted - RC-50R

SKU: ASD-RC-50R
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 50 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$500.00
Astrodon Johnson-Cousins UVBRI Photometric Filters

Astrodon Photometric Johnson-Cousins Ic Filter - 49.7 mm Round Unmounted - IC-50R

SKU: ASD-IC-50R
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 50 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$500.00
Astrodon Johnson-Cousins UVBRI Photometric Filters

Astrodon Photometric Johnson-Cousins UV Filter - 49.7 mm Square Unmounted - UV-50S

SKU: ASD-UV-50S
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$550.00
Astrodon Johnson-Cousins UVBRI Photometric Filters

Astrodon Photometric Johnson-Cousins B Filter - 49.7 mm Square Unmounted - B-50S

SKU: ASD-B-50S
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$550.00
Astrodon Johnson-Cousins UVBRI Photometric Filters

Astrodon Photometric Johnson-Cousins V Filter - 49.7 mm Square Unmounted - V-50S

SKU: ASD-V-50S
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
Free shipping Free shipping
$550.00
Astrodon Johnson-Cousins UVBRI Photometric Filters

Astrodon Photometric Johnson-Cousins Rc Filter - 49.7 mm Square Unmounted - RC-50S

SKU: ASD-RC-50S
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
Free shipping Free shipping
$550.00
Astrodon Johnson-Cousins UVBRI Photometric Filters

Astrodon Photometric Johnson-Cousins Ic Filter - 49.7 mm Square Unmounted - IC-50S

SKU: ASD-IC-50S
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$550.00
Astrodon 50 mm Round Unmounted Luminance Gen2 UV/NIR Block Filter

Astrodon Luminance Gen2 UV/NIR Blocking Filter - 49.7 mm Square Unmounted - L2-50S

SKU: ASD-L2-50S
  • Filter Type: UV/IR/Luminance
  • Filter Size: 50 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
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$403.00

Astrodon 3 nm H-Alpha Narrowband Filter - 31 mm Unthreaded Insert - HA3-31R

SKU: ASD-HA3-31R
  • Filter Type: H-Alpha
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$574.00
Astrodon 31 mm Unthreaded 3 nm OIII Narrowband Filter

Astrodon 3 nm OIII Narrowband Filter - 31 mm Unthreaded Insert - OIII3-31R

SKU: ASD-OIII3-31R
  • Filter Type: OIII
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$574.00

Astrodon Clear Filter with UV-Blocking Only - 31 mm Unthreaded Insert - C2-31R

SKU: ASD-C2-31R
  • Filter Type: Clear
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$183.00
Astrodon 31 mm Unthreaded Luminance Filter with UV/NIR Blocking

Astrodon Luminance UV/NIR Blocking Filter - 31 mm Unthreaded Insert - L2-31R

SKU: ASD-L2-31R
  • Filter Type: UV/IR/Luminance
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$194.00

Astrodon 5 nm H-Alpha Narrowband Filter - 31 mm Unthreaded Insert - HA5-31R

SKU: ASD-HA5-31R
  • Filter Type: H-Alpha
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$390.00
Astrodon SII 5 nm Narrowband Filter - 31 mm Unthreaded

Astrodon 5 nm SII Narrowband Filter - 31 mm Unthreaded Insert - SII5-31R

SKU: ASD-SII5-31R
  • Filter Type: SII
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$390.00
Astrodon 31 mm Unthreaded OIII Narrowband Filter - 5 nm

Astrodon 5 nm OIII Narrowband Filter - 31 mm Unthreaded Insert - OIII5-31R

SKU: ASD-OIII5-31R
  • Filter Type: OIII
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$390.00

Astrodon 5 nm Red Continuum Narrowband Filter - 31 mm Unthreaded Insert - REDCON5-31R

SKU: ASD-REDCON5-31R
  • Filter Type: Continuum (Not Solar)
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$390.00
3 nm SII Narrowband Filter - 31 mm Unthreaded Insert

Astrodon 3 nm SII Narrowband Filter - 31 mm Unthreaded Insert - SII3-31R

SKU: ASD-SII3-31R
  • Filter Type: SII
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
Free shipping Free shipping
$574.00
3 nm NII Narrowband Filter - 31 mm Unthreaded Insert

Astrodon 3 nm NII Narrowband Filter - 31 mm Unthreaded Insert - NII3-31R

SKU: ASD-NII3-31R
  • Filter Type: NII
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
Free shipping Free shipping
$574.00

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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