In cinematography, available light or ambient light refers to any source of light that is not explicitly supplied by the filmier for the purpose of shooting footage. The term usually refers to sources of light that are already available naturally.

The use of available light may pose a challenge for cineast. The brightness and direction of the light is often not adjustable, except perhaps for indoor lighting. This will limit the selection of shooting speeds, and may require the use of shades or reflectors to manipulate the light. It can also influence the time, location, and even orientation of the film shoot to obtain the desired lighting conditions.
Levels of ambient light are most frequently considered relative to additional lighting used as fill light, in which case the ambient light is normally treated as the key light. The relative intensity of ambient light and fill light is known as the lighting ratio, an important factor in calculating contrast in the finished image.

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