Vivitar ND8 Neutral Density Filter - (VIV-ND8-52) Enables slow shutter speeds to record movement in subjects such as waterfalls, clouds, and cars. Decrease depth of field by allowing wider apertures to be used. This helps separate subjects from their background. Decreases the effective ISO of high speed film and allow it to be used outdoors in bright situations. Allows cine and video cameras to film subjects such as snow, sand or other bright scenes that would normally cause over-exposure. Vivitar Filters are manufactured from high-quality solid optical materials. Each individual filter is heat-treated to avoid any rare movement or distortion