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Radian Triad Ultra Narrowband Filter 52mm


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  • Shoot in any light polluted area
  • H-beta, OIII, H-alpha, and SII Band Passes
  • Works with any camera including DSLRs
  • Exceptional narrowband & luminance filter
  • If your telescope is f/3 or faster, you need the fast telescopes version here
  • Photo Credit: Ross Clark

Product Details

  • Unmatched Multi-Narrowband Performance

    The Triad Ultra filter stands alone in its class as a filter with four ultra-narrow bandpasses that cover Hydrogen alpha, Hydrogen beta, Sulfur II, and Oxygen III wavelengths - the four most common wavelengths for narrowband astrophotography. As a multi-narrowband filter, the Triad Ultra is designed to photograph emission nebulae, planetary nebulae, and supernova remnants, and excels at doing so from light pollution. However, we recommend you try it from dark skies as well - the narrow bandpasses will give you tighter stars and more pronounced nebulosity.

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

    Use Case for Monochrome Cameras

    You might think that the Triad Ultra is only designed for color cameras, but it actually works great on monochrome cameras too! A traditional luminance filter has a broad bandpass that lets light in from around 400 to 700nm. This works well for broadband imaging of galaxies and reflection nebulae, for example, but will be affected heavily by light pollution with such a broad bandpass. With the Triad Ultra, you can gather luminance data in all four major wavelengths while simultaneously cutting out light pollution and you get the added benefit of keeping the stars tight and small. Think of it as the ultimate luminance filter for your monochrome camera!

    American Made

    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:

    Jason Guenzel Nebula with RASA and Triad Ultra

    The Triad 52mm filter is housed in a 7mm tall ring, with 5mm height above the threads. The ring wall thickness is between 1.3 and 2.58mm - depending on production batch. Please double check to make sure this will fit your filter wheel or accessories.

    Shop the full Radian Triad Filter Lineup

  • specifications

    Filter ShapeRound
    Filter Thickness3mm
    Filter TypeLight Pollution/City Light Suppression
    Filter TypeTriad
    Free ShippingYes
  • included items

    • 52mm Triad Ultra Quad-Band Filter
    • Filter case

Product Reviews

Customer Reviews
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Filter Reviews:
Naoto K.
Japan Japan
The performance is very good, but the size is different from the notation. that's why. I was worried whether it was genuine.

(labels) The Triad 52mm filter is housed in an 11mm tall ring, with 7.6mm height above the threads. The filter thickness is 3mm. (Actual measurement) The Triad 52mm filter is housed in an 5.1mm tall ring, with 3.1mm height above the threads. The filter thickness is 1mm.

OPT Telescopes Radian Telescopes 52mm Triad Ultra Quad-Band Narrowband Filter Review