The antistatic coating acts like a force field around the filter to repel dust. Perfect for environments where dust is common, these filters require less frequent cleaning and maintenance than traditional filters. The hardened top-layer is water repellent, stain and scratch resistant, and cleans easily when smudges or fingerprints are introduced to the surface. Circular polarizing filters allow photographers to achieve creative, in-camera, effects not possible after the image is created. A polarizing filter simply filters out unwanted reflections from non-metallic surfaces such as water and glass in addition to light reflecting off moisture and pollution in the atmosphere. By rotating the ultra-smooth filter you can select just the right amount of filtration needed to achieve the creative effect. This results in bluer skies, greener leaves, reduced or eliminated reflections, and greater clarity in your final image. The professional grade high-performance optical glass used yields very high light transmission rates which means the filter has virtually no effect on the colour balance, contrast or clarity of the final image beyond its polarizing effects. The filter features a lightweight, two-piece, very low-profile aluminium frame to house the glass. The low-profile frame eliminates vignetting when used on ultra-wide-angle lenses.