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Filters

Items 51 - 75 of 628

Optolong Moon SkyGlow Filter - 2" Mounted - MSG-200

SKU: OTL-MSG-200
  • Filter Type: SkyGlow
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$48.00

Optolong UV-IR Cut Filter - 1.25" Mounted - UVIR-125

SKU: OTL-UVIR-125
  • Filter Type: UV/IR/Luminance
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$44.00

Optolong UV-IR Cut Filter - 2" Mounted - UVIR-200

SKU: OTL-UVIR-200
  • Filter Type: UV/IR/Luminance
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$65.00

Optolong Clear Focusing Filter - 1.25" Mounted - CFF-125

SKU: OTL-CFF-125
  • Filter Type: Clear
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$24.00

Optolong Clear Focusing Filter - 2" Mounted - CFF-200

SKU: OTL-CFF-200
  • Filter Type: Clear
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$31.00

Optolong Night Sky H-Alpha Filter - 1.25" Mounted - NSHA-125

SKU: OTL-NSHA-125
  • Filter Type: H-Alpha
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$79.00

Optolong Night Sky H-Alpha Filter - 2" Mounted - NSHA-200

SKU: OTL-NSHA-200
  • Filter Type: H-Alpha
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$119.00

Optolong IR Pass 685nm Filter - 1.25" Mounted - IRPS685-125

SKU: OTL-IRPS685-125
  • Filter Type: UV/IR/Luminance
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$79.00

Optolong IR Pass 685nm Filter - 2" Mounted - IRPS685-200

SKU: OTL-IRPS685-200
  • Filter Type: UV/IR/Luminance
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$119.00 $95.20

Optolong Venus U Filter - 1.25" Mounted - VEU-125

SKU: OTL-VEU-125
  • Filter Type: Fringe-Killer/Minus Violet
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$195.00

Optolong Venus U Filter - 2" Mounted - VEU-200

SKU: OTL-VEU-200
  • Filter Type: Fringe-Killer/Minus Violet
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$250.00

Optolong Neutral Density ND3 Filter - 1.25" Mounted - ND3-125

SKU: OTL-ND3-125
  • Filter Type: Neutral Density/Moon
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$49.00

Optolong Neutral Density ND3 Filter - 2" Mounted - ND3-200

SKU: OTL-ND3-200
  • Filter Type: Neutral Density/Moon
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$79.00

Optolong Variable Polarizer Filter - 1.25" Mounted - VPO-125

SKU: OTL-VPO-125
  • Filter Type: Polarizing
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$39.00

Optolong Variable Polarizer Filter - 2" Mounted - VPO-200

SKU: OTL-VPO-200
  • Filter Type: Polarizing
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
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$48.00

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
Optolong SII Unmounted Filter

Optolong SII CCD 12nm Filter - 31mm Unmounted - SIICCD12-31U

SKU: OTL-SIICCD12-31U
  • Filter Type: SII
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$153.00 $125.00
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 - 31mm Unmounted - SIICCD65-31U

SKU: OTL-SIICCD65-31U
  • Filter Type: SII
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$193.00
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 - 31mm Unmounted - HAL7-31U

SKU: OTL-HAL7-31U
  • Filter Type: H-Alpha
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$190.00
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 - 31mm Unmounted - LRGB-31U

SKU: OTL-LRGB-31U
  • Filter Type: RGB
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
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$291.00

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

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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