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Filters

Items 1 - 25 of 55

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
Optolong SII Unmounted Filter

Optolong SII CCD 12nm Filter - 36mm Unmounted - SIICCD12-36U

SKU: OTL-SIICCD12-36U
  • Filter Type: SII
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$159.00 $127.00
Optolong SII Unmounted Filter

Optolong SII CCD 6.5nm Filter - 36mm Unmounted - SIICCD65-36U

SKU: OTL-SIICCD65-36U
  • Filter Type: SII
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$199.00
Optolong H-Alpha Unmounted Filter

Optolong H-Alpha 7nm CCD Filter - 36mm Unmounted - HAL7-36U

SKU: OTL-HAL7-36U
  • Filter Type: H-Alpha
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$193.00

Optolong LRGB CCD Filter Set - 36mm Unmounted - LRGB-36U

SKU: OTL-LRGB-36U
  • Filter Type: RGB
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$299.00
Optolong UVIR Cut Unmounted Filter

Optolong UV-IR Cut Filter - 36mm Unmounted - UVIR-36U

SKU: OTL-UVIR-36U
  • Filter Type: UV/IR/Luminance
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$56.00

Astrodon 3 nm H-Alpha Narrowband Filter - 36 mm Round Unmounted - HA3-36R

SKU: ASD-HA3-36R
  • Filter Type: H-Alpha
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$748.00

Astrodon 3 nm NII Narrowband Filter - 36 mm Round - NII3-36MR

SKU: ASD-NII3-36MR
  • Filter Type: NII
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$639.00
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 SII Narrowband Filter - 36 mm Round - SII3-36R

SKU: ASD-SII3-36R
  • Filter Type: SII
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$748.00
Astrodon 36 mm Round H-Alpha 5 nm Narrowband Filter

Astrodon 5 nm H-Alpha Narrowband Filter - 36 mm Round - HA5-36R

SKU: ASD-HA5-36R
  • Filter Type: H-Alpha
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$501.00

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

Astrodon 5 nm SII Narrowband Filter - 36 mm Round Unmounted - SII5-36R

SKU: ASD-SII5-36R
  • Filter Type: SII
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$501.00
Baader Planetarium Narrowband CCD Filter Set - 36 mm Round H-Alpha, SII, and O-III Filters

Baader Narrowband CCD Filter Set with 36 mm Round H-Alpha 7 nm, O-III, and SII Filters - FNSET3-RD36

SKU: BAD-FNSET3-RD36
  • Filter Type: Narrowband Set
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$497.00
Baader 36 mm LRGBC Filter Set

Baader LRGBC CCD Filter Set - 36 mm Unmounted - FLRGBC-RD36

SKU: BAD-FLRGBC-RD36
  • Filter Type: RGB
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$524.00
Baader 36 mm Round LRGB Filter Set

Baader LRGB CCD Filter Set - 36 mm Round Unmounted - FLRGB-RD36

SKU: BAD-FLRGB-RD36
  • Filter Type: RGB
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$477.00
Baader SII 8nm Narrowband Filter - 36 mm Round

Baader S-II 8 nm Narrowband CCD Filter - 36 mm Unmounted - FSIIN-RD36

SKU: BAD-FSIIN-RD36
  • Filter Type: SII
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$188.00
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 36 mm H-alpha 7 nm Narrowband Filter

Baader H-Alpha 7 nm Narrowband CCD Filter - 36 mm Unmounted - FHALN-RD36

SKU: BAD-FHALN-RD36
  • Filter Type: H-Alpha
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$195.00

ZWO LRGB Filter Set - 36mm Unmounted - LRGB-36

SKU: ZWO-LRGB-36
  • Filter Type: RGB
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$199.00
Astronomik 36 mm CLS-CCD Light Pollution Filter

Astronomik CLS CCD Light Pollution Filter - 36 mm Round - CLSCCD-36

SKU: ASF-CLSCCD-36
  • Filter Type: CLS/LPR
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$129.95
Astronomik 36 mm Round MC Clear Filter

Astronomik MC Clear Glass Filter - 36 mm Round - C-36

SKU: ASF-C-36
  • Filter Type: Clear
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$59.95

ZWO H-Alpha 7nm CCD Filter - 36mm - Ha7nmD36

SKU: ZWO-HA7NMD36
  • Filter Type: H-Alpha
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$169.00

ZWO SII 7nm Filter - 36mm - SII7nmD36

SKU: ZWO-SII7NMD36
  • Filter Type: SII
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$169.00

ZWO OIII 7nm Filter - 36mm - OIII7nmD36

SKU: ZWO-OIII7NMD36
  • Filter Type: OIII
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$169.00

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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