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Radian Telescopes 50mm Triad Ultra Quad-Band Narrowband Filter

ITEM #
OS-TRIAD-ULT50MM
  • Price:
  • Sale
  • Regular price $1,175.00

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Accessories Added

  • 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 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. Telescopes with focal ratios faster than f/2.8 are incompatible with the Triad Ultra filter.

 

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
  • Radian microfiber cloth
  • Filter case