The Tiffen 72mm Variable Neutral Density Filter is a unique, versatile and flexible tool, affording you the convenience of using several Neutral Density filters all in one. Primarily used as a photographic tool for controlling depth of field and exposure, the Variable ND is being sought in the video market as well because it is fast, easy to use, small and lightweight. Features The Neutral density filters reduce the amount of light going through the lens into your camera. The filter allows the use of slow shutter speeds, with high speed films or digital cameras, to record movement/image blur in subjects such as waterfalls, clouds or any fast moving subject. Control the Depth of Field The ND filter gives you full control over your depth of field. You are able to decrease depth of field by using wider apertures, which helps separate subjects from their background and it also allows you to shoot high speed film (above ISO 400) in bright outdoor situations by reducing effective ISO. Lightweight and Easy to Use The Neutral Density filter enables cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which could cause overexposure.