The Schneider Optics 4.5" Black Frost filters flare highlights, mute colors, and tone down contrast, while retaining rich blacks. This is a very useful combination of effects for 16mm and 35mm film, as well as for HD and standard video. The Black Frost is primarily a styling, or mood modifying filter. Depending on the grade chosen, they subtly enhance a scene without degrading the image quality or black saturation. The Black Frost was design for cinematographers to enable them to capture blacker blacks than are possible with similar types of filters.