Radian Telescopes 1.25" Triad Ultra Quad-Band Narrowband 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
- Filter size: 1.25-inch
- Usable on telescopes up to f/2.2 speed!
- Photo Credit: Ross Clark
Accessories Added
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Radian Telescopes 1.25" Triad Ultra Quad-Band Narrowband Filter
The Radian Triad 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% |
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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!Â
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The Triad 1.25-inch filter is housed in an 11 mm tall ring, with 7.6 mm height above the threads. The ring wall thickness is between 1.68 and 2.49 mm - depending on the production batch. Please double check to make sure this will fit your filter wheel or accessories.
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SPECIFICATIONS
| Filter Shape | Round |
|---|---|
| Filter Thickness | 3mm |
| Filter Type | Triad |
| Free Shipping | Yes |
| Size | 1.25" |
INCLUDED ITEMS
- 1.25-inch Triad Ultra Filter
- Filter case