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Optolong CLS-CCD Filter -1.25" Mounted - CLSCCD-125

SKU: OTL-CLSCCD-125

Regularly stocked item that is on order with the manufacturer and on its way to our warehouse. Expected to arrive within 5-10 business days.

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Optolong CLS-CCD Filter - 1.25”



The Optolong CLS-CCD filter will boost contrast and increase visibility of faint outer regions on most emission nebulae, planetary nebulae, and supernova remnants from light polluted areas when photographed with a color imaging camera.



The infrared wavelength of 700-1100nm is cut off on the Optolong CLS-CCD Filter, making it different from the standard CLS filter and rendering the CLS-CCD a photographic filter only. There is no need to use a separate IR-cut filter when imaging with the CLS-CCD, because the IR has already been cut for you!

The Optolong CLS-CCD filter works by selectively reducing the transmission of light pollution wavelengths, especially artificial light pollution caused by high and low pressure sodium vapor and mercury vapor lights. Using a CLS-CCD filter will also increase contrast by reducing the skyglow caused by naturally occurring neutral oxygen emissions in our atmosphere.



The Optolong 1.25” CLS-CCD Filter is made Schott glass that has been multi-coated with ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL. The filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted, black anodized, and then laser engraved. The result is a super thin filter cell that will produce a clear aperture of 26mm.



Transmission Characteristics of CLS-CCD Filter



  • 95% transmission H-Alpha 656nm

  • 95% transmission OIII 496nm and 500nm

  • 95% transmission SII 672nm

  • 95% transmission H-Beta 486nm

  • High transmission NII 654nm and 658nm

  • 0.1% transmission Hg at 435nm and 578nm

  • 0.1% transmission Na at 589nm

  • Blocks transmission IR 700-1100nm


Quality Filter Materials:



  • Schott B260 substrate material from Germany, 2.0mm thick

  • CNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture; Laser-engraved to prevent fading

  • Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition


Optolong Filter Manufacturing Processes and Parameters




  • Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces

  • Surface quality, according to MIL-O-13830, is 60/40

  • Main nebula emission lines has a transmission of 95%

  • Off-band (major emission lines of artificial light pollution) transmission is 0.1%

  • High value transmission of pass-band and optical density of off-band is assured through Optolong’s planetary rotation system, a homogenous and precise coating procedure

  • Thin metal cells have a clear aperture of 26mm for 1.25” filters

  • Each filter comes with a plastic case with high pressure EVA case lining


About Optolong



Optolong is the Astronomy Filters division of Yulong Optics, an optical filter design and processing company out of Kunming, China that has provided filters for over 700 optical companies since 1999. All Optolong filters pass European Union RoHS requirements and have been certified by TUV Rheinland and Bureau Veritas.

Description
Description

Optolong CLS-CCD Filter - 1.25”

The Optolong CLS-CCD filter will boost contrast and increase visibility of faint outer regions on most emission nebulae, planetary nebulae, and supernova remnants from light polluted areas when photographed with a color imaging camera.

The infrared wavelength of 700-1100nm is cut off on the Optolong CLS-CCD Filter, making it different from the standard CLS filter and rendering the CLS-CCD a photographic filter only. There is no need to use a separate IR-cut filter when imaging with the CLS-CCD, because the IR has already been cut for you!

The Optolong CLS-CCD filter works by selectively reducing the transmission of light pollution wavelengths, especially artificial light pollution caused by high and low pressure sodium vapor and mercury vapor lights. Using a CLS-CCD filter will also increase contrast by reducing the skyglow caused by naturally occurring neutral oxygen emissions in our atmosphere.

The Optolong 1.25” CLS-CCD Filter is made Schott glass that has been multi-coated with ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL. The filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted, black anodized, and then laser engraved. The result is a super thin filter cell that will produce a clear aperture of 26mm.

Transmission Characteristics of CLS-CCD Filter

  • 95% transmission H-Alpha 656nm
  • 95% transmission OIII 496nm and 500nm
  • 95% transmission SII 672nm
  • 95% transmission H-Beta 486nm
  • High transmission NII 654nm and 658nm
  • 0.1% transmission Hg at 435nm and 578nm
  • 0.1% transmission Na at 589nm
  • Blocks transmission IR 700-1100nm

Quality Filter Materials:

  • Schott B260 substrate material from Germany, 2.0mm thick
  • CNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture; Laser-engraved to prevent fading
  • Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition

Optolong Filter Manufacturing Processes and Parameters

  • Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces
  • Surface quality, according to MIL-O-13830, is 60/40
  • Main nebula emission lines has a transmission of 95%
  • Off-band (major emission lines of artificial light pollution) transmission is 0.1%
  • High value transmission of pass-band and optical density of off-band is assured through Optolong’s planetary rotation system, a homogenous and precise coating procedure
  • Thin metal cells have a clear aperture of 26mm for 1.25” filters
  • Each filter comes with a plastic case with high pressure EVA case lining

About Optolong

Optolong is the Astronomy Filters division of Yulong Optics, an optical filter design and processing company out of Kunming, China that has provided filters for over 700 optical companies since 1999. All Optolong filters pass European Union RoHS requirements and have been certified by TUV Rheinland and Bureau Veritas.

Specifications
Specifications
Model Number CLSCCD-125
Single Filter, Set, or Accessory Single Filter
Filter Type CLS/LPR
Filter Size 31.75 mm (1.25")
Filter Shape Round
Filter Insert Style Threaded
What's in the Box?
What's in the Box?
  • Optolong 1.25" CLS-CCD Filter
  • Filter Case
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