The Kenko 46mm Smart MC UV Filter eliminates ultra-violet rays which can sometimes cause a hazy, blue cast in outdoor colour photography. UV filters also protect the front element of your lens against dust, moisture & scratches. UV filters are especially useful when photographing scenes such as mountains, beaches, areas of snow, & any other situations where there is a lot of UV light present. The slim frame is idea for wide-angle lenses & the multi-coated glass helps prevent flare & ghosting.