This UV filter is a useful tool to minimize the affection of Ultraviolet Rays. Ultraviolet Rays will cause a bluish cast in your photos and it often makes outdoor photographs hazy and indistinct due to the Ultraviolet Rays caused by atmospheric haze. * High Light Transmission glass has no affect on exposure. * Front thread available which is convenient for adding additional filter or lens cap / cover etc... * Also can be used as permanent protector for your lens, since this UV filter will not affect the original colors and focus. * The filter ring is made of durable metal.