Great News to Fuji, Olympus and Pentax Users! STC Astro-Multispectra Clip Filter Is Now Available for You! - Vendor and Group Announcements - Cloudy Nights
STC Astro Duo Narrowband 2-inch filter review - BBC Sky at Night Magazine
STC Astro Duo-Narrowband Filter - William Optics
STC Launch Clip Filter Range for Olympus Cameras – 43 Rumors