Fahrenheit scale is a scale of temperature named after its German originator, G. D. Fahrenheit. A composition device used in various ways to produce images in which foreground and background objects appear to occupy the same plane. Farmer's reducer is used for bleaching negatives and prints. See reducers Farraday shutter is a high-speed shutter using a pair of crossed polarizers, between which is a glass block within a coil. When a voltage passes through the coil, the plane of polarization changes, allowing light to pass through the second polarizer.
Fast film is film which has an emulsion that is very sensitive to light.
These films have high ISO ratings. Fenton, Roger 1819-1869. First to document war scenes in the Crimean War during 1855. Ferric chloride is a bleaching solution used on negative materials. Ferrotype process is a method of creating direct positive images with dark enameled metal plates as a base.