The NiSi Prosories P1 Kit lets you attach square filters to your smartphone

Chinese accessory company NiSi has started taking preorders for its new Prosories P1 Smartphone Filter Kit, a camera filter system for smartphones. The P1 Kit includes a phone clip, medium graduated neutral density filter, polarizer, pouch, and holder. As demonstrated in the video below, the system involves attaching a mount over the phone's camera, then sliding a square filter into that mount. The P1 Kit's filters are made from optical glass with a nano-coating, according to NiSi, which says it...