A set of barn doors is an attachment fitted to the front of lighting fixtures used in films, television, and theatres. 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 fixture, and prevent light from spilling into areas where it is not wanted, such as the camera s lens or the eyes of audience members.canonglossaryus
Gobos (light-blocking devices) that attach to studio lights and swivel on hinges (like the doors on a barn) to allow the photographer to control the light’s direction and the width of the light beam.
Attachment that fits on the front of a studio light and allows the photographer to control the spread of light.
accessory used on spotlights and flood lamps to control the direction of light and width of the beam.