Dual and tri(ad) narrowband filter for dslr and co: Astrophotography Talk Forum Forum: Digital Photography Review
William Optics STC Astro Duo-Narrowband Filter 48mm (2")
STC Filter - William Optics
AstroPixelProcessor on Twitter: "Astro Pixel Processor 1.068 has been released ;-) - Special Debayer Algoritmes for Dual Narrowband Filters like the STC Astro Duo & OPT TRIAD Tri-Band Narrowband filters https://t.co/PwXUpkOiuY #Astrophotography #