Optolong SII Narrowband Telescope Filter

  • SII 6.5nm CCD Deep Sky Imaging Filter
  • Select your filter size: 1.25", 31mm, 36mm, or 2"
  • 80% peak transmission
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  • Regular price $175.00
  • $175.00
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Optolong SII Narrowband Telescope Filter

The SII-CCD 6.5 nm Deep Sky Imaging Filter:

This filter is an extra narrowband SII-CCD 6.5 nm filter (Sulfur II for CCD) is designed for nebula observation allowing 6.5 nm bandwidth of light centered on a wavelength of 672 nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).

Main Use and Performance

  • Use with H-alpha and OIII-CCD extra narrowband filters (SHO Set) for tricolor CCD astrophotography
  • Narrowband imaging with SHO set can be done with the moon up in heavy light pollution, so your equipment is not sitting dormant for several weeks
  • Hubble look of images can be made by the combination of H-alpha, OIII-CCD and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle Nebula)
  • Narrowband filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.

Optolong LRGB Ha SII & OIII Telescope Filter Kit-SII graph


Features of the SII Filter:

Technical Data

  • Schott substrate material
  • Thickness 2.0 mm
  • Surface Quality: 60/40 (Refer to MIL-O-13830)
  • Fine-optically polished to ensure accurate 1/4 wavefront and <30 seconds parallelism over the both surfaces
  • The SII filter has 80% transmission, the SII line is 672 nm
  • Precision off-band blocking

Coating Parameter

  • Multi-layers anti-reflection coating
  • Non-cementing optical substrate coating
  • Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change
  • Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band

Filter Cell

  • Ultra-thin filter cell minimize vignetting by maximize possible clear aperture (clear aperture is 26 mm for 1.25-inch; 45 mm for 2-inch)
  • Aerometal Material
  • Precise CNC Machining
  • Sand Blasting Process
  • Black Anodized Finish
  • Extinction Treatment to Prevent Reflection
  • Laser Engraving No Fading



BandpassNarrow Bandpass at 672nm
Filter Thickness2mm
Filter TypeSII
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