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Optolong SII 6.5nm Filter - EOS Full Frame Clip - EOSFF-SII65 - Used

SKU: UEQ-8973-OTL-EOSFF-SII65

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List price: $249.00

Our price: $145.00

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  • This Optolong SII 6.5nm Filter is Used and in Good Condition. Upon inspection, we found signs of use, including dust and smudges. However the filter is fully functioning.
  • Image shows new product.
  • Comes with High Point 90-Day Warranty



Optolong SII 6.5nm CCD Clip Filter
for Canon EOS Full Frame Cameras




The Optolong Sulfur II 6.5nm Extra Narrowband Filter transmits a 6.5nm bandwidth of light that is centered at 672nm and drastically reduces other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural). Like all Optolong filters that are designated as “CCD”, this SII filter also blocks infrared wavelengths from 700nm to 1100nm so you don't need a separate IR-Cut filter.



The Optolong 6.5nm SII filter can be used in conjunction with H-Alpha and OIII filters for false color emission line images like the Hubble Space Telescope.



The Optolong SII 6.5nm EOS Full Frame Clip Filter is made with Schott glass that has been multi-coated with an 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.



Using a Clip Filter on your Canon Full Frame Camera





  • The Optolong EOS FF Clip filter can be inserted without tools; just use your fingers to insert or remove the filter. Once inserted correctly, it cannot unintentionally fall out.


  • No changes to the housing of Canon EOS DSLR are required. All lens functions will work with the Clip installed, including focus, screen, and image stabilization,


  • The Optolong clip filter prevents dust from settling on the sensor during long exposures.


  • The EOS FF clip filters are compatible with EOS Full Frame series cameras, such as the 1D X, 5D, and 6D. If you have a standard APS-C EOS camera, Optolong offers clip filters for these cameras as well.


  • Optolong Clip Filters do not function with the Canon EF-S series lenses. These lenses invade the space inside the camera body that would normally be taken up by the clip filter.


  • To use EOS/T2 and 2” adapters to attach your camera to a telescope you’ll need to insert the Clip-Filter first and then install the desired lens adapters.


Quality Filter Materials:



  • Schott B260 substrate material from Germany, 1.0mm 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

  • 80% transmission at SII line 672nm

  • Infrared wavelength 700-1100nm cut-off

  • 0.1% transmission Hg at 435nm and 578nm

  • 0.1% transmission Na at 589nm

  • 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

  • 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

  • This Optolong SII 6.5nm Filter is Used and in Good Condition. Upon inspection, we found signs of use, including dust and smudges. However the filter is fully functioning.
  • Image shows new product.
  • Comes with High Point 90-Day Warranty

Optolong SII 6.5nm CCD Clip Filter
for Canon EOS Full Frame Cameras

The Optolong Sulfur II 6.5nm Extra Narrowband Filter transmits a 6.5nm bandwidth of light that is centered at 672nm and drastically reduces other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural). Like all Optolong filters that are designated as “CCD”, this SII filter also blocks infrared wavelengths from 700nm to 1100nm so you don't need a separate IR-Cut filter.

The Optolong 6.5nm SII filter can be used in conjunction with H-Alpha and OIII filters for false color emission line images like the Hubble Space Telescope.

The Optolong SII 6.5nm EOS Full Frame Clip Filter is made with Schott glass that has been multi-coated with an 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.

Using a Clip Filter on your Canon Full Frame Camera

  • The Optolong EOS FF Clip filter can be inserted without tools; just use your fingers to insert or remove the filter. Once inserted correctly, it cannot unintentionally fall out.
  • No changes to the housing of Canon EOS DSLR are required. All lens functions will work with the Clip installed, including focus, screen, and image stabilization,
  • The Optolong clip filter prevents dust from settling on the sensor during long exposures.
  • The EOS FF clip filters are compatible with EOS Full Frame series cameras, such as the 1D X, 5D, and 6D. If you have a standard APS-C EOS camera, Optolong offers clip filters for these cameras as well.
  • Optolong Clip Filters do not function with the Canon EF-S series lenses. These lenses invade the space inside the camera body that would normally be taken up by the clip filter.
  • To use EOS/T2 and 2” adapters to attach your camera to a telescope you’ll need to insert the Clip-Filter first and then install the desired lens adapters.

Quality Filter Materials:

  • Schott B260 substrate material from Germany, 1.0mm 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
  • 80% transmission at SII line 672nm
  • Infrared wavelength 700-1100nm cut-off
  • 0.1% transmission Hg at 435nm and 578nm
  • 0.1% transmission Na at 589nm
  • 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
  • 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 EOSFF-SII65
Filter - Single or Set? Single Filter
Filter Size EOS Full Frame Clip
Filter Type Narrowband Imaging
Filter Shape EOS Clip
Mounted or Unmounted? Mounted
Filter Warranty Two Years
What's in the Box?
What's in the Box?
  • Optolong SII 6.5nm Filter in Canon EOS Full Frame Clip Format
  • Filter Case
  • Image taken with Optolong SII 6.5nm Filter
  • Optolong SII 6.5nm Filter Transmission
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