- Lamp black
- Pure carbon pigment made from soot deposited from burning oils.
- An acronym for Light Amplification by the Stimulated Emission of Radiation. A laser is a device that emits a light beam that has special qualities. Most lasers are a pure color and travel in a beam without spreading.
- Lead acetate
- Crystalline, highly poisonous powder used in some toning and intensifying solutions.
- Method of increasing relative film speed by fogging after exposure and before development. It can be achieved by chemical or light means.
- Lenticular screen
- Lens system consisting of a screen containing a number of small lenses. There are two applications of lenticular systems. They are used in some exposure meters to gather light and to determine the angle of acceptance of light by the meter. A lenticular screen consisting of a number of lenses set into rows can be used at the camera stage to produce stereoscopic images by synthesizing binocular vision.
- Light trap
- System of entry to a darkroom which allows easy access, but prevents unwanted light from entering.
- Linked Ring Brotherhood
- Group of pictorialist photographers who broke away from the Photographic Society of Great Britain. Existed between 1892-1910.
- Lippmann process
- Early color process invented by Professor Gabriel Lippmann (1845-1921). Light first passed through an almost transparent emulsion layer and was then reflected back by a layer of mercury. The interference between reflected and incident light produced a latent image in the emulsion which could be given b&w processing, but when backed with a mirror appeared in color.
- Local control
- Method of controlling the final quality of a print by increasing or decreasing the exposure given to localized areas of the print by selective masking.