What is a metal flag used for in lighting?

A metal flag is primarily utilized in lighting to block a beam of light. This function is essential in controlling light spill and ensuring that light only reaches the desired areas of a stage or set. By using a metal flag, designers can effectively eliminate unwanted light that may distract from the action or create undesired effects. This ability to block light helps in shaping the overall lighting design without needing to cut off electricity or adjust the fixtures themselves.

Moreover, metal flags can also create shadows or specific lighting effects that enhance the visual storytelling in a production. They are an essential tool in the lighting designer's arsenal for maintaining control over how light interacts with the stage environment.