Radian Telescopes 50mm Round Triad Ultra Quad-Band Narrowband Filter

ITEM #
RT-TRIAD-ULT50MM
  • 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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  • Regular price $1,175.00

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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 ShapeRound
Filter Size50mm
Filter Thickness3mm
Filter TypeQuadband

INCLUDED ITEMS

Included:

  • 50 mm Round Unmounted Triad Ultra Filter
  • Filter case