Review: The Astrophotography Filter That 'Deletes' Light Pollution on Full-Frame Cameras | Fstoppers
Astro Multispectra (MS) Filter - STC Optics
Great News to Fuji, Olympus and Pentax Users! STC Astro-Multispectra Clip Filter Is Now Available for You! - Vendor and Group Announcements - Cloudy Nights
Review: The Astrophotography Filter That 'Deletes' Light Pollution on Full-Frame Cameras | Fstoppers