Camera filters for a variety of camera mounts in standard sizes as well as unmounted flat Blue Didymium round filters. If you need a size not listed above, please contact the factory for pricing and availability. Also available on this page are unedged flat polished Blue Didymium filters in 75 mm and 80 mm diameters. Have an iPhone 11 or GoPro? We have an unmounted (no ring) Blue Didymium filter in 50 mm available. Just use some tape or a couple of drops of soft removable adhesive to hold it in place. **We use a variety of suppliers for the base UV ring, any name brand shown on the selected ring is not a guarantee that that brand will be on the ring that you receive. All filters are laminated with optically clear UV adhesive and cured under a 365nm UV lamp for three hours to ensure a complete cure.