You may have a TriBand or QuadBand filter without knowing it. - Beginning Deep Sky Imaging - Cloudy Nights
Altair TriBand 1 25" Filter
Radian Triad Ultra Narrowband Filter 2" | OPT Telescopes
Filters – EverydayAstro
OPT Triad Ultra Filter Review | My Results with a DSLR and Astro Camera
Radian Triad Tri-Band Narrowband Filter 2" | OPT Telescopes
North America Nebula 135mm with TriBand filter - Beginning Deep Sky Imaging - Cloudy Nights
Optolong 2" L-Enhance Tri Band Filter
OPT Filters Triad Tri-Band Narrowband Filter 2"
OPT Filters Triad Ultra Quad-Band Narrowband Filter 2"
Radian Triad Tri-Band Narrowband Filter 2" | OPT Telescopes
Radian Triad Tri-Band Narrowband Filter 2" | OPT Telescopes
NIB Altair Astro Tri-Band 2" CCD filter for OSC narrowband imaging | Astromart
You may have a TriBand or QuadBand filter without knowing it. - Beginning Deep Sky Imaging - Cloudy Nights
Duo,tri or quad band filter? - DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging - Cloudy Nights
OPT just announced their Quad-Band narrowband filter - Page 3 - Beginning Deep Sky Imaging - Cloudy Nights
Tri-band and other narrow band imaging of emission nebulae with a colour camera – Professor Morison's Astronomy Digest
Triad Narrowbandfilters - Getting Started With Imaging - Stargazers Lounge
Radian Triad Tri-Band Narrowband Filter 2" | OPT Telescopes
OPT Triad Ultra Filter Review | My Results with a DSLR and Astro Camera
