- 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
Image Note: Mounted filter is shown for filter view only. This is an Unmounted filter.
DESCRIPTION
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 3mm.
Since the filter has extremely narrow band passes, telescopes with focal ratios faster than f/4 will move transmission off band. Telescopes with focal ratios between f/2.9 and f/3.9 are compatible with Triad Ultra, with lower transmissions. Between f/2.2 and f/2.8 will have about 0.8nm band-shift.
Image Note: Mounted filter is shown for filter view only. This is an Unmounted filter.
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SPECIFICATIONS
| Filter Shape | Round |
| Filter Size | 50mm |
| Filter Thickness | 3mm |
| Filter Type | Quadband |
INCLUDED ITEMS
Included:
- 50 mm Round Unmounted Triad Ultra Filter
- Filter case