A Neutral Density Filter has several uses and offers the possibility to achieve otherwise unachievable results.So why use a Neutral Density Filter?- To enable slow shutter speeds to be used, to capture movement in subjects such as waterfalls, clouds, or cars- To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background- To decrease the effective ISO of high speed film (above ISO 400) and allow it to be used outdoors in bright situations- To allow DSLR cameras to film bright scenes which could cause overexposureTech SpecsMulti-coated to minimize reflection at the filter surfaces which reduces flare and ghosting.Neutral Density Factor2 StopType: Neutral DensitySize: 55mmCoating: Multi-CoatedEffect: ND filters appear gray and reduce the amount of light reaching the film, they have no affect on color balanceApplication: To use high speed films in bright sunColor Temperature: Not ApplicableConstruction: GlassFront Filter Thread Size: 55mm