[Ruhapi2 (Peter)]

Hi I have a basically brand new Radian Triad Ultra Narrowband Filter.

Radian TRIAD Ultra Quad-Band Filter
2" Mounted filter
Used once only..

Reason for sale, this filter is not suited to my RASA's fast optics. Fast optics requires the fast version of this filter.

Retail price - $827US (approx $1200 AUD)

$600 includes postage within Australia

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

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 colour 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.