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Filters > Nebulae filters > UHC Filters > OPT > Triad Ultra > OPT Filters Triad Ultra Quad-Band Narrowband Filter 2"
Product no.: 61632

Filters Triad Ultra Quad-Band Narrowband Filter 2"

$ 2,280.00 incl. VAT, plus shipping costs
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Product description

OPT Radian Triad Ultra Quad-Band Narroband Filter

The 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.

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.

Transmission lines:

H-Beta: 79% Peak Transmission, 5nm FWHM

O-III: 97% Peak Transmission, 4nm FWHM

H-Alpha: 87% Peak Transmission, 4nm FWHM

S-II: 90% Peak Transmission, 4nm FWHM

Specifications

Capacity


Connection (to the telescope)
2"
Frame
2"

General


Series
Triad Ultra
Type
Filters
Type of build
UHC Filters

Area of application


Anti light-pollution
yes
Hydrogen nebulae
yes
Planetary nebulae
yes
Supernova remains
yes
Useful for photographs
yes
Visually useful
no
OPT Filters Triad Ultra Quad-Band Narrowband Filter 2"
OPT Filters Triad Ultra Quad-Band Narrowband Filter 2"
OPT Filters Triad Ultra Quad-Band Narrowband Filter 2"
OPT Filters Triad Ultra Quad-Band Narrowband Filter 2"

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