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. Also known as the tin-type process. Fiber based paper is photographic paper without a resin coating. Processing times are longer than for other papers, but the paper is more archivally permanent. Field camera is a sheet film camera suitable for use in location work.