Barn doors
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Barn doors, or colloquially a set of barn doors, are an attachment fitted to the front of a Fresnel lantern, a type of spotlight used in films, television, and theatres. They can also be attached to Par cans, another type of light used in theater, television, and film. The attachment has the appearance of a large set of barn doors, but in fact there are four leaves, two larger and widening on the outside, two smaller and getting narrower towards the outside. They facilitate shaping of the beam of light from the light, and prevent the distinctive scatter of light created by the Fresnel lens from spilling into areas where it is not wanted, such as the eyes of audience members.
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