The 85 x 85mm Neutral Density Filter Starter Kit with 58mm Adapter Ring from Hitech includes 0.6 and 0.9 neutral density filters made from high quality optical resin as well as a 85mm filter holder and 58mm adapter ring. Neutral density filters create a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required. By slowing your exposure time or increasing your aperture, you are able to control depth of field and convey movement more easily. Neutral density filters do not affect the overall coloration of the image.