Ambient Light (Available Light) refers to any source of light that is not explicitly supplied by the photographer for the purpose of taking photos. The term usually refers to sources of light that are already available naturally (e.g. the sun, moon, lightning) or artificial light already being used (e.g. to light a room). It generally excludes flashes, although arguably flash lighting provided by other photographers shooting simultaneously in the same space could be considered available light. (source: Wikipedia.com)

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