In black-and-white and color photography, filters such as the KODAK WRATTEN Neutral Density Filter No. 96 reduce the intensity of light reaching the film without affecting the tonal rendition in the original scene. In motion-picture work or other photography, neutral density filters allow use of a large aperture to obtain differential focusing. You can use them when filming in bright sunlight or with very fast films. These filters control exposure when the smallest aperture is still too large.
