Definitions for "Focusing screen"
Keywords:  plane, nikon, camera, glass, preview
Used for focusing on a subject or composing a picture; the focusing screen is located at a position equivalent to that of the film plane. To provide dispersion, a matte field made of specially ground glass or plastic is generally used for focusing screens.
Glass or plastic screen set at the camera's image-forming plane, where the image can be viewed and focused. (see Finder)
Refers to Ground Glass. Usually on large format cameras, a piece of frosted glass at the focal plane where the lens projects an image that can be used for focusing and composition.