The Radian Triad Square filter has now been improved upon! With the Triad Ultra, you now have narrower band-passes, more light pollution reduction, higherÂ 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.
The Triad Ultra is 100% American made and usesÂ advanced multi-coatings and extreme tolerance glass,Â to ensure itÂ is always consistent and accurate. Filter thickness is 3 mm.
Below you'll see anÂ incredible image of the Rosette Nebula taken by Jason Guenzel using the Triad Ultra on the super-fast f/2.2Â Celestron RASA telescope!Â
This filter is the 65 mm square unmounted selection.