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Used Radian Telescopes 52mm Triad Ultra Quad-Band Narrowband Filter

SKU : UT-14969

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  • This Used item is in "Like New" condition and comes with all original packaging.
  • Shoot in any light-polluted area
  • H-beta, OIII, H-alpha, and SII Band Passes
  • Works with any color camera including DSLRs
  • Exceptional narrow-band-luminance filter
  • Filter size:¬†52mm
  • Usable on telescopes up to f/2.2 speed!
  • Photo Credit: Ross Clark

Product Details

  • The Radian Triad filter has now been improved upon! With the Triad Ultra, you now have narrower band-passes, more light pollution reduction, higher contrast, better separation between H-beta and OIII channels, and sensitivity in the Sulfur II emission lines. Like the original Triad filter, the Triad Ultra is designed to work with color cameras but also as a narrow-band-luminance filter for monochrome cameras.

    Hydrogen-beta Oxygen III Hydrogen-alpha Sulfur II
    FWHM 5nm 4nm 4nm 4nm
    Peak Transmission 79% 97% 87% 90%


    The Triad Ultra is 100% American made and uses advanced multi-coatings and extreme tolerance glass, to ensure it is always consistent and accurate. Filter thickness is 3mm.

    Below you'll see an incredible image of the Rosette Nebula taken by Jason Guenzel using the Triad Ultra on the super-fast f/2.2 Celestron RASA telescope!

    Jason Guenzel Nebula with RASA and Triad Ultra


    The Triad 52mm filter is housed in an 11mm tall ring, with 7.6mm height above the threads. The ring wall thickness is between 1.68 and 2.49mm - depending on the production batch. Please double check to make sure this will fit your filter wheel or accessories.


  • specifications

    Filter TypeTriad
  • included items

    • 52mm¬†Triad Ultra Filter
    • Filter case

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