The Sigma 49mm Protector Filteris developed to protect the lens surface from dirt and dust as well as scratches. It is an ideal filter for regular use as it is completely colourless so does not affect colour reproduction. Sigma 49mm Protector Filter The Sigma 49mm Protector filter, is designed to 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. The Protector excellent antistatic performance, prevents microscopic dust clinging to the surface. Even if the lens gets soiled, dust can be easily removed using an air-blower. By incorporating a thinner frame (except 86mm, 95mm and 105mm) to avoid vignetting even with super wide-angle lenses, it i