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Radian Triad Ultra Narrowband Filter 65mm
The Triad Ultra filter stands alone in its class as a filter with four ultra-narrow bandpasses that cover Hydrogen alpha, Hydrogen beta, Sulfur II, and Oxygen III wavelengths – the four most common wavelengths for narrowband astrophotography. As a multi-narrowband filter, the Triad Ultra is designed to photograph emission nebulae, planetary nebulae, and supernova remnants, and excels at doing so from light pollution. However, we recommend you try it from dark skies as well – the narrow bandpasses will give you tighter stars and more pronounced nebulosity.
| Hydrogen-beta | Oxygen III | Hydrogen-alpha | Sulfur II | |
|---|---|---|---|---|
| FWHM | 5nm | 4nm | 4nm | 4nm |
| Peak Transmission | 79% | 97% | 87% | 90% |
You might think that the Triad Ultra is only designed for color cameras, but it actually works great on monochrome cameras too! A traditional luminance filter has a broad bandpass that lets light in from around 400 to 700nm. This works well for broadband imaging of galaxies and reflection nebulae, for example, but will be affected heavily by light pollution with such a broad bandpass. With the Triad Ultra, you can gather luminance data in all four major wavelengths while simultaneously cutting out light pollution and you get the added benefit of keeping the stars tight and small. Think of it as the ultimate luminance filter for your monochrome camera!
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.
Below you’ll see an incredible image of the Rosette Nebula taken by Jason Guenzel using the Triad Ultra:
The Triad 65mm filter is unmounted and designed for very large optical systems.
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