Light is polarized to a greater or lesser extent depending on the angle of incidence when reflected from non-electrically conductive, i.e. almost all non-metallic surfaces. With the circular polarizing filter (CIR-PL) unwanted light reflections can be reduced and color saturation and contrast can be improved. Blue skies become more intense and clouds become more vivid without affecting the overall color balance. The Hoya Fusion Antistatic Professional filters use an antistatic coating that acts like a magnetic field in the opposite direction to keep dust and dirt away from the filter surface. The Hoya Antistatic filters get by with far less maintenance due to their special properties. The hardened, antistatic surface also repels water and rain and can be easily and gently cleaned of dirt stains and fingerprints if required. This protects the glass and prevents scratches caused by even the smallest particles of dust and dirt. Hoya Fusion Antistatic Professional Filters are made of hand-picked silicates. By careful melting and elaborately mixed into high-quality glass components. Good workmanship and high-quality materials guarantee the always constant Hoya quality. The antistatic effect is achieved by a special 9-layer Super Multi-Coating formula, which also greatly reduces reflections without impairing light transmission. The flat aluminium filter frame is constructed in two parts and prevents vignetting. This makes the filter perfect for use with wide-angle lenses.