The Cygnus Loop Supernova Remnant (William Optics STC) | Flickr
STC Astro Duo-Narrowband filter 2 inch
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 #
ZWO Duo-Band Filter | ZWO ASI
William Optics STC Astro Duo-Narrowband Filter - 48mm - YF-STC-ADN
William Optics STC Ultra Layer Astro Multispectra Filter - 48mm - David Astro