Radian Telescopes 50mm Round 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
- 50 mm Round Unmounted Triad Ultra Filter
Image Note: Mounted filter is shown for filter view only. This is an Unmounted filter.
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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.
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 0.8 nm 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