描述
Barndoor is generally constructed of four leaves and attached to the front of lighting fixture to shape the beam of the light. It is usually used for the diffuse light like a Fresnel, flood light, and Par Can, in order to get a more focused coverage field or prevent the light spilling into the areas where it is not wanted. As "profile" light like Source Four has more focused beam, it is rarely used with barndoor.
Four-leaves barndoors are also available in variety dimension for TV / Film lighting fixtures.
