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Filters

Items 1 - 25 of 32
Astrodon I-Series 1.25" Threaded Cell Tru-Balance LRGB Filter Set

Astrodon Gen2 I-Series LRGB Tru-Balance Filter Set - 1.25" Threaded Cell - LRGB2-I27R

SKU: ASD-LRGB2-I27R
  • Filter Type: RGB
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$547.00
Astrodon Sloan Generation 2 U Filter - 1.25" Round Mounted

Astrodon Photometric Sloan Gen2 U Filter - 320/385 nm - 1.25" Threaded Cell - U2-27R

SKU: ASD-U2-27R
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$212.00
Astrodon Edge-Blackened Sloan Generation 2 Filters with Transmission Chart

Astrodon Photometric Sloan Gen2 G Filter - 401/550 nm - 1.25" Threaded Cell - G2-27R

SKU: ASD-G2-27R
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$212.00
Astrodon Edge-Blackened Sloan Generation 2 Filters with Transmission Chart

Astrodon Photometric Sloan Gen2 R Filter - 562/695 nm - 1.25" Threaded Cell - R2-27R

SKU: ASD-R2-27R
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$212.00
Astrodon Edge-Blackened Sloan Generation 2 Filters with Transmission Chart

Astrodon Photometric Sloan Gen2 I Filter - 695/844 nm - 1.25" Threaded Cell - I2-27R

SKU: ASD-I2-27R
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$212.00
Astrodon Edge-Blackened Sloan Generation 2 Filters

Astrodon Photometrics Sloan Gen2 Y Filter - 950/1058 nm - 1.25" Threaded Cell - Y2-27R

SKU: ASD-Y2-27R
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$212.00

Astrodon 5 nm Red Continuum Narrowband Filter - 1.25" Threaded Cell - REDCON5-27R

SKU: ASD-REDCON5-27R
  • Filter Type: RGB
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$380.00
Astrodon Johnson-Cousins UVBRI Photometric Filters

Astrodon Photometric Johnson-Cousins UV Filter - 1.25" Threaded Cell - UV-27R

SKU: ASD-UV-27R
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$216.00
 Photometric Johnson-Cousins B Filter

Astrodon Photometric Johnson-Cousins B Filter - 1.25" Threaded Cell - B-27R

SKU: ASD-B-27R
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$216.00
Astrodon Johnson-Cousins UVBRI Photometric Filters

Astrodon Photometric Johnson-Cousins V Filter - 1.25" Threaded Cell - V-27R

SKU: ASD-V-27R
  • Filter Type: Photometric (UBVIR, Johnson-Cousins)
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$216.00

Astrodon E-Series Tru-Balance Red Filter - 1.25" Threaded Cell - R2-E27R

SKU: ASD-R2-E27R
  • Filter Type: RGB
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
$184.00

Astrodon E-Series Tru-Balance Green Filter - 1.25" Threaded Cell - G2-E27R

SKU: ASD-G2-E27R
  • Filter Type: RGB
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
$184.00

Astrodon E-Series Tru-Balance Blue Filter - 1.25" Threaded Cell - B2-E27R

SKU: ASD-B2-E27R
  • Filter Type: RGB
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
$184.00

Astrodon I-Series Tru-Balance Red Filter - 1.25" Threaded Cell - R2-I27R

SKU: ASD-R2-I27R
  • Filter Type: RGB
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
$184.00

Astrodon I-Series Tru-Balance Green Filter - 1.25" Threaded Cell - G2-I27R

SKU: ASD-G2-I27R
  • Filter Type: RGB
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
$184.00

Astrodon I-Series Tru-Balance Blue Filter - 1.25" Threaded Cell - B2-I27R

SKU: ASD-B2-I27R
  • Filter Type: RGB
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
$184.00
Astrodon Narrowband Filters

Astrodon 3 nm NII Narrowband Filter - 1.25" Threaded Cell - NII3-27R

SKU: ASD-NII3-27R
  • Filter Type: NII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$564.00
Astrodon Generation 2 E-Series 1.25" Threaded Cell Tru-Balance LRGB Filter Set

Astrodon Gen2 E-Series LRGB Tru-Balance Filter Set - 1.25" Threaded Cell - LRGB2-E27R

SKU: ASD-LRGB2-E27R
  • Filter Type: RGB
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$547.00
Astrodon UVenus UV Imaging Filter

Astrodon UVenus UV Imaging Filter - 1.25" Threaded Cell - UVENUS-27R

SKU: ASD-UVENUS-27R
  • Filter Type: Fringe-Killer/Minus Violet
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$209.00

Astrodon Luminance Gen2 UV/NIR Blocking Filter - 1.25" Threaded Cell - L2-27R

SKU: ASD-L2-27R
  • Filter Type: UV/IR/Luminance
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$184.00

Astrodon Clear Filter with UV-Blocking Only - 1.25" Threaded Cell - C2-27R

SKU: ASD-C2-27R
  • Filter Type: Clear
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$173.00

Astrodon 5 nm H-Alpha Narrowband Filter - 1.25" Threaded Cell - HA5-27R

SKU: ASD-HA5-27R
  • Filter Type: H-Alpha
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$380.00

Astrodon 3 nm H-Alpha Narrowband Filter - 1.25" Threaded Cell - HA3-27R

SKU: ASD-HA3-27R
  • Filter Type: H-Alpha
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$564.00
Astrodon Narrowband Filters

Astrodon 5 nm OIII Narrowband Filter - 1.25" Threaded Cell - OIII5-27R

SKU: ASD-OIII5-27R
  • Filter Type: OIII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$380.00
Astrodon Narrowband Filters

Astrodon 3 nm OIII Narrowband Filter - 1.25" Threaded Cell - OIII3-27R

SKU: ASD-OIII3-27R
  • Filter Type: OIII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$564.00

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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