Optolong SII CCD 12nm Filter - 36mm Unmounted - SIICCD12-36U

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  • The Sulfur II CCD by Optolong is a high-performance Extra-Narrowband Filter
  • Designed to block wavelengths notorious for light pollution
  • Also blocks infrared wavelengths from 700nm to 1100nm so you don't need a separate IR-Cut filter
  • Crafted from multi-coated Schott glass with an ion-assisted deposition technology
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  • Description

    Optolong SII CCD 12nm Filter - 36mm  Unmounted

    The Sulfur II 12nm Narrowband Filter by Optolong! This filter functions by transmitting a 12nm bandwidth of light centered on the 672nm wavelength, and reducing of wavelengths responsible for pesky light pollution. Wavelengths that are responsible for natural light pollution, or skyglow, are drastically reduced, as is artificial light pollution caused by high and low-pressure sodium vapor and mercury vapor lights. The result is a high contrast image that reveals objects glowing at 672nm, even under light polluted skies or when the Moon is at or near full. Use this filter with OIII and H-Alpha 12nm filters to get false color emission line images like the Hubble Space Telescope does.

    A 12nm SII filter is recommended for cameras that have an integrated guiding sensor. You’ll have lots more guide stars to choose from with a 12nm filter as opposed to the extra-narrowband 6.5nm version. Like all Optolong filters that are designated as “CCD”, this S-II filter also blocks infrared wavelengths from 700nm to 1100nm so you don't need a separate IR-Cut filter.

    The Optolong 36mm Unmounted SII 12nm 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. This 12nm SII filter is designed to be used in filter wheels that accept 36mm unmounted filters in a round format.


    Quality Filter Materials:

    • Schott B260 substrate material from Germany, 2.0mm thick
    • 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
    • 90% transmission at SII 672nm
    • Infrared wavelength of 700-1100nm is 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 homogeneous 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.


    Supplier SKU


    What's Included

    • Optolong 36mm Unmounted SII CCD 12nm Filter

    • Filter Case

  • Dimensions & Specifications

    • Filter Size: 36 mm

    • Filter Type: Narrowband Imaging

    • Filter Shape: Round

    • Mounted or Unmounted: Unmounted

  • Product Guarantee

    We stand behind all the products we sell, and your satisfaction is our top priority. If you're not satisfied with the quality of your purchase, simply send the item back to us in its original packaging within 30 days of its delivery.

    Manufacturer Warranty

    Two Years

    Return & Exchange Policy

    At our site, returns are easy! You may return new, unused, and resalable items for a refund or exchange. Simply ensure that the item is returned in its original product packaging within 30 days of delivery.

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