Neutral density filters may be used with all types of films. They block the entire visible spectrum evenly and allow light reduction without influencing color rendition or contrast. They are designed to reduce aperture values. When there is to much light, or a wide aperture is required, ND filters is used. For use of high-speed films or long-exposure motion effects , the ND filters are ideal.

ND filters of higher values are required for observation of the sun or when photographing smelters and other intense sources.