Reduce water reflections, increase contrast and enhance sky blue colours with the SIGMA 52mm WR Circular Polariser CPL Filter. Sigma's weather-resistant (WR) circular polariser (CP) filters remove reflections on the water's surface and glass windows, and increases the contrast in landscape photography. This effect is often used to increase the contrast and saturation in blue skies and white clouds. With excellent water and oil repellent functions, the filter surface repels water drops and provides resistance to fingerprints. Even if they appear on the surface they can be easily removed. Sigma 52mm WR Circular Polarising Filter removes the reflection of water surface and glass windows, and increases the contrast in landscape photography. Sigma 52mm WR Circular Polarising Filter Sigma 52mm WR Circular Polarising Filter removes the reflection of water surface and glass windows, and increases the contrast in landscape photography. You can avoid vignetting or the decrease in peripheral light quantities especially when the thinner wide type filters are used with SIGMA lenses. By incorporating Sigmas Super Multi-Layer Coating, the filter reduces flare and ghosting. In addition, black rimmed glass eliminates unnecessary internal reflections and provides high performance for both digital cameras and film cameras. With excellent Water and Oil repellent functions, the filter surface repels water drops and provides resistance to fingerprints. Even if they appear on the surface they can be easily removed. The WR filter excellent antistatic performance.