A UV filter protects your camera's lens from scratches, dust, dirt, moisture and fingerprints, while reducing unwanted ultra-violet light. Cameras are more sensitive to ultraviolet light than our eyes are. A blue haze may appear in pictures taken when there is excessive UV light. A UV filter can reduce atmospheric haze when it is caused by blue radiation and ultraviolet. Since our eyes cannot see this part of the spectrum, UV filters, also known as skylight or haze filters, are recommended for all outdoor shooting.