OPT Filters Triad Ultra Quad-Band Narrowband Filter 2"

The Triad Ultra offers narrower band-passes, delivering superior light pollution reduction, heightened contrast, improved separation between H-beta and OIII channels, and enhanced sensitivity in the Sulfur II emission lines. Designed to accommodate color cameras, it also serves as a narrow-band-luminance filter for monochrome cameras, ensuring versatility in your imaging pursuits.

Crafted with precision in the USA, the Triad Ultra employs advanced multi-coatings and extreme tolerance glass to guarantee consistent and accurate performance. With a thickness of 3mm, this filter exemplifies durability and reliability in every use.

Please note that due to its extremely narrow band passes, telescopes with focal ratios faster than f/4 may experience transmission off-band. Telescopes with focal ratios between f/2.9 and f/3.9 are compatible with the Triad Ultra, albeit with lower transmissions. Telescopes with focal ratios faster than f/2.8 are not compatible with this filter.

Transmission Lines:

• H-Beta: Peak Transmission 79%, 5nm FWHM
• O-III: Peak Transmission 97%, 4nm FWHM
• H-Alpha: Peak Transmission 87%, 4nm FWHM
• S-II: Peak Transmission 90%, 4nm FWHM

Specifications:

Connection to Telescope: 2"

Frame Size: 2"

Series: Triad Ultra

Type: Filters

Type of Build: UHC Filters

Anti Light-Pollution: Yes

Suitable for Hydrogen Nebulae: Yes

Suitable for Planetary Nebulae: Yes

Suitable for Supernova Remnants: Yes

Useful for Photographs: Yes

Visually Useful: No