Nisi’s CPL series ultra thin filters adopted a special thin-film technology and equipped with the newest high quality Japanese original polarizing film, the edge of lens is all painted with Japanese polishing paint for anti-reflection, which weakens greatly the impact of spots and ill-defined rays on imaging, and this technique can eliminate completely the useless light reflection from non-metallic surfaces. High quality lens assures CPL filters smooth surface. Meanwhile, the frame is made of ultra thin high quality aluminum additionally, superfine dull polishing and elaborate knurling make sure that the frame will not blanch because of repeated rotation; this ultra thin filter frames to help avoid vignetting on super wide angle lenses.. all materials used in this filter meet the requirements of European Union’s standards of environment protection—ROHS(Restrictions on Hazardous Substances), No hazardous. Furthermore, screw thread in front of the frame makes it easy to fix the lens cap and other accessories.