Skip to content

We're Open, Shipping & Available If You Need Us!

Filters

Items 1 - 25 of 66
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
Free shipping Free shipping
$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
Free shipping Free shipping
$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
Free shipping Free shipping
$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
Free shipping Free shipping
$199.00

Optolong SII CCD 6.5nm Filter - 1.25" Mounted - SIICCD65-125

SKU: OTL-SIICCD65-125
  • Filter Type: SII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
Free shipping Free shipping
$159.00

Optolong SII CCD 6.5nm Filter - 2" Mounted - SIICCD65-200

SKU: OTL-SIICCD65-200
  • Filter Type: SII
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
Free shipping Free shipping
$250.00
Astronomik SII 12 nm CCD Clip Filter for Canon EOS R/RP Full Frame Mirrorless Cameras

Astronomik SII 12 nm CCD Filter - Canon EOS R XL Full Frame Clip - SII-EOS-R-XL

SKU: ASF-SII-EOS-R-XL
  • Filter Type: SII
  • Filter Size: EOS R/RP
  • Filter Shape: EOS Clip
  • Filter Insert Style: Clip-In
Free shipping Free shipping
$329.95
Astronomik SII 6 nm CCD Clip Filter for Canon EOS R/RP Full Frame Mirrorless Cameras

Astronomik SII 6 nm CCD Filter - Canon EOS R XL Full Frame Clip - SII6-EOS-R-XL

SKU: ASF-SII6-EOS-R-XL
  • Filter Type: SII
  • Filter Size: EOS R/RP
  • Filter Shape: EOS Clip
  • Filter Insert Style: Clip-In
Free shipping Free shipping
$519.95

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
Free shipping Free shipping
$748.00
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
Free shipping Free shipping
$1,145.00
Astrodon 3 nm SII Narrowband 49.7 mm Round Filter

Astrodon 3 nm SII Narrowband Filter - 65 mm Square Unmounted - SII3-65S

SKU: ASD-SII3-65S
  • Filter Type: SII
  • Filter Size: 65 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
Free shipping Free shipping
$2,495.00

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
Free shipping Free shipping
$501.00
Baader Planetarium 2" SII 8 nm Narrowband CCD Filter

Baader S-II 8 nm Narrowband CCD Filter - 2" Mounted - FSIIN-2

SKU: BAD-FSIIN-2
  • Filter Type: SII
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
Free shipping Free shipping
$234.00
Astronomik 12 nm SII CCD Filter - 1.25" Round Mounted

Astronomik SII 12 nm CCD Filter - 1.25" - SII-1

SKU: ASF-SII-1
  • Filter Type: SII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
Free shipping Free shipping
$129.95
Astronomik 2" Round Mounted SII CCD Filter - 12 nm

Astronomik SII 12 nm CCD Filter - 2" - SII-2

SKU: ASF-SII-2
  • Filter Type: SII
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
Free shipping Free shipping
$289.95
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
Free shipping Free shipping
$188.00
Baader SII 8nm Narrowband Filter - 50.4 mm Round

Baader S-II 8 nm Narrowband CCD Filter - 50.4 mm Unmounted - FSIIN-RD50

SKU: BAD-FSIIN-RD50
  • Filter Type: SII
  • Filter Size: 50.4 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
Free shipping Free shipping
$299.00
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
Free shipping Free shipping
$360.00
Baader SII 8nm Narrowband Filter - 65 mm Square

Baader S-II 8 nm Narrowband CCD Filter - 65 mm Square Unmounted - FSIIN-SQ65

SKU: BAD-FSIIN-SQ65
  • Filter Type: SII
  • Filter Size: 65 mm
  • Filter Shape: Square
  • Filter Insert Style: Drop-In
Free shipping Free shipping
$479.00
Baader SII High Speed f/2 CCD Filter

Baader f/2 High Speed SII CCD Filter - 1.25" Mounted - FSIIHS-1

SKU: BAD-FSIIHS-1
  • Filter Type: SII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
Free shipping Free shipping
$219.00
Baader SII High Speed f/2 CCD Filter

Baader f/2 High Speed SII CCD Filter - 2" Mounted - FSIIHS-2

SKU: BAD-FSIIHS-2
  • Filter Type: SII
  • Filter Size: 50.8 mm (2")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
Free shipping Free shipping
$352.00

ZWO SII 7nm Filter - 1.25" - SII7nm1.25

SKU: ZWO-SII7NM1.25
  • Filter Type: SII
  • Filter Size: 31.75 mm (1.25")
  • Filter Shape: Round
  • Filter Insert Style: Threaded
Free shipping Free shipping
$129.00

ZWO SII 7nm Filter - 31mm - SII7nmD31

SKU: ZWO-SII7NMD31
  • Filter Type: SII
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
Free shipping Free shipping
$149.00

ZWO SII 7nm Filter - 36mm - SII7nmD36

SKU: ZWO-SII7NMD36
  • Filter Type: SII
  • Filter Size: 36 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
Free shipping Free shipping
$169.00
Astronomik 31 mm Round SII 12 nm CCD Filter

Astronomik SII 12 nm CCD Filter - 31 mm - SII-31

SKU: ASF-SII-31
  • Filter Type: SII
  • Filter Size: 31 mm
  • Filter Shape: Round
  • Filter Insert Style: Drop-In
Free shipping Free shipping
$169.95

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.

High Point Scientific is rated 4.9/5 based on 1347 reviews