67mm polarizing filter with nano-coating and high resolution. - Brand: NiSi - Model Name: PRO Nano CPL - Filter Diameter: 67mm - Features: Nano-coating, high resolution, proprietary polarizing film, screw-in silver filter ring Thank you for viewing. ◼️Usage Experience This was the first CPL filter I purchased, and it beautifully brought out the contrast between the blue sky and the green forest, as well as removing reflections on the water surface. ◼️Reason for Selling I no longer need this filter because I sold the lens that it fits. It is a beautiful item that has only been used about 3 to 5 times.