Product Details

• Description
• Specifications
• Included Items
• Reviews

• The Radian Triad Square 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 3 mm.

  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! 

  

  This filter is the 65 mm square unmounted selection.

   

• specifications

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

• included items

  • Triad Ultra Filter: 65 mm square unmounted
  • Filter case