Product Details

• Description
• Specifications
• Included Items
• Reviews
• Recommended Accessories

• 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:

  

  The Triad 65mm filter is unmounted and designed for very large optical systems.

  Shop the full Radian Triad Filter Lineup

  • Radian Triad Ultra Narrowband Filter 2"
  • Radian Triad Ultra Narrowband Filter 1.25"
  • Radian Triad Ultra Narrowband Filter 52mm
  • Radian Triad Ultra Narrowband Filter 65mm (THIS PRODUCT)
  • Radian Triad Ultra Narrowband Filter 2" - For Fast Telescopes
  • Radian Triad Ultra Narrowband Filter 1.25" - For Fast Telescopes
  • Radian Triad Tri-Band Narrowband Filter 2"
    
  • Radian Triad Tri-Band Narrowband Filter 1.25"

• specifications

  Filter Shape	Square
  Filter Thickness	3mm
  Filter Type	Light Pollution/City Light Suppression
  Filter Type	Triad
  Free Shipping	Yes
  Size	65mm

• included items

  • 65mm Triad Ultra Quad-Band Filter
  • Filter case