These filters are used by many photographers to protect the front element of their lens from abrasions, dust, and moisture. They also have a very subtle warming effect, which can be useful to counter the cool colours you sometimes get in bright sun or in shade. They're available in sizes to fit most EF lenses....
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.
