Optolong LRGB CCD Filter Set - 31mm Unmounted - LRGB-31U

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This high-performance LRGB CCD Filter Set by Optolong includes four 31mm filters:
  • Luminance
  • Red
  • Green
  • Blue
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  • Description

    Optolong LRGB Filter Set - 31mm Unmounted

    This versatile LRGB Filter Set by Optolong give you an array of four 31mm unmounted filters. The included filters are Red, Green, Blue, and Luminance. Designed for de-bayered monochrome CCD and CMOS cameras, these filters are excellent for both planetary and deep-sky imaging. Like all Optolong filters that are designated “CCD”, this filter set blocks infrared wavelengths from 700nm to 1100nm so there is no need to use a separate IR-Cut filter.

    The transmission of each filter is designed for maximum contrast and beautiful results. There is a gap between the green and red filters that improves color balance and separation by blocking out the Sodium line at 589nm. Also, OIII emission is allowed to overlap on the blue and green filters for more natural color.

    The Optolong 31mm Unmounted LRGB Filter Set 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 filter set is designed to be used in color filter wheels that accept 31mm unmounted filters in a round format.


    Quality Filter Materials:

    • Schott B260 substrate material from Germany, 3.0mm 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
    • 95% transmission at bandpass
    • Infrared wavelength 700-1100nm cut-off
    • Optolong’s planetary rotation system is a homogenous and precise coating procedure that ensures both high transmission of pass-band and optical density of off-band
    • 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 31mm Unmounted Luminance Filter

    • Optolong 31mm Unmounted Red Filter

    • Optolong 31mm Unmounted Green Filter

    • Optolong 31mm Unmounted Blue Filter

    • Filter Case

  • Dimensions & Specifications

    • Filter Size: 31 mm

    • Filter Type: LRGB Imaging

    • Filter Shape: Round

    • Mounted or Unmounted: Unmounted

    • Filter Set Contents: Luminance/Red/Green/ Blue 31mm Round Unmounted Filters

  • 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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