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Radian Telescopes 1.25" Triad Ultra Quad-Band Narrowband Filter

ITEM #
OS-TRIAD-ULT125
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  • Regular price $975.00

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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

DESCRIPTION

Radian Telescopes 1.25" Triad Ultra Quad-Band Narrowband Filter

The Radian Triad filter has now been improved upon! With the 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 Notes:

Rosette Nebula by: Peter_Meyers_Triad_Filter

Triad-Ultra-North-American-Nebula

 

 

SPECIFICATIONS

Filter ShapeRound
Filter Size1.25"
Filter Thickness3mm
Filter TypeQuadband

INCLUDED ITEMS

  • 1.25" Triad Ultra Filter
  • Filter case

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