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A Neutral Density filter or ND filteris a "grey" filter,it appear gray and reduce the amount of light reaching the film or sensor, but do not have an effect on color balance. The purpose of standard photographic neutral density filters is to allow the photographer greater flexibility to change the aperture or exposure time, allowing for more control, particularly in extreme circumstances such as on a very bright day. Neutral Density filters have several uses and offer the possibility of achieving otherwise impossible results. ND filters appear gray and reduce the amount of light reaching the film. ND filters also do not have an effect on color balance. 67mm Neutral density -8 filter Omax 1) Enables slow shutter speeds to be used, especially with high-speed films, allowing film to record movement in subjects such as waterfalls, clouds, or cars. 2) Decrease depth of field by allowing wider apertures to be used, in turn helping to separate subjects from their background. 3) Decrease the effective ISO of high-speed film (above ISO 400) and allow it to be used outdoors in bright situations. 4) To allow picture and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes that can cause overexposure. Whats in the box 1x ND8 Filter 67mm 1x Filter Case