Radian Telescopes 50mm Round Triad Ultra Quad-Band Narrowband Filter

The Radian Telescopes Triad filter has now been improved upon! With the 50 mm Round Unmounted 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! 

 

Image Note: Mounted filter is shown for filter view only.  This is an Unmounted filter.

• 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
• 50 mm Round Unmounted Triad Ultra Filter
• Usable on telescopes up to f/2.2 speed!
• Photo Credit: Ross Clark

Image Note: Mounted filter is shown for filter view only.  This is an Unmounted filter.

• 50 mm Round Unmounted Triad Ultra Filter
• Filter case