Strictly speaking, existing light covers all natural lighting from moonlight to sunshine. For photographic purposes, existing light is the light that is already on the scene or project and includes room lamps, fluorescent lamps, spotlights, neon signs, candles, daylight through windows, outdoor scenes at twilight or in moonlight, and scenes artificially illuminated after dark. The range of camera exposures from underexposure to overexposure that will produce acceptable pictures from a specific film. An instrument with a light-sensitive cell that measures the light reflected from or falling on a subject, used as an aid for selecting the exposure setting. The same as a light meter.
Fast film is film which has an emulsion that is very sensitive to light.
These films have high ISO ratings. 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. Called fill-in flash when electronic flash is used. Film A photographic emulsion coated on a flexible, transparent base that records images or scenes.