The Tiffen 52mm HT Neutral Density 1.2 Filter reduces the amount of light entering the lens by 4 stops without changing the colour of the scene. Because of the 4 stop decrease you are able to use the aperture you need to enable you to play with backgrounds, distance & depth of field, or to use long exposures (slow shutter speeds) to give an impression of motion. They are often used in bright conditions when capturing landscapes & seascapes. These Tiffen HT filters with hi-trans double-sided titanium multi-coating surpass even military specifications for hardness & durability.