Circular Polarizer Filter, Eliminates Reflections & Glare, Improves Contrast & Saturation, Japanese AGC Optical Glass, 28-Multilayer Nano Coating, Waterproof, Oil & Scratch Resistant, Aluminum Frame, Rotating Filter. Minimize reflections and glare with the 86mm Nano-X Series CPL Filter from K&F Concept. The CPL filter cuts reflected polarized light and removes unwanted reflections from non-metallic surfaces such as water or glass which are often associated with landscape photography. The filter also increases color saturation improving contrast without affecting the overall color balance of the scene. This will give you enhanced blue sky or green foliage. The filter's amount of filtration varies according to how the filter is rotated.