Canon filters are available for nearly every EF lens. Whether it's protection from the elements or the effects of a circular polarizer Canon filters enhance images and protect your investment. UV filter is a colorless filter which absorbs ultraviolet radiation without affecting visible light. It is effective for reducing distant haze in landscape pictures taken on sunny days especially when using black-and-white film. The filter has no effect on exposure and little effect on color temperature and can be used as a protective filter.