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   NiSi's CPL series Ultra thin filters apply a special thin-film technology and are equipped with the newest high quality Japanese Original Polaroid film and special technique of double sided, multi-coating, which helps increase transmittance while reduce reflectivity. 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 removes unwanted reflections from non-metallic surfaces. High quality lens assure CPL filters' smooth surface. Meanwhile, Ultra thin frame while using a high-quality aluminum frame (thickness only 7.05 mm), 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), it contains nothing hazardous. As well, screw thread in front of the frame makes it easy to install the lens cap and other accessories.