The barndoors are used for special effect photography. They are essential for directing light source in specific areas of the scene and for flagging or blocking light from "spilling" into unwanted areas of the scene. This lighting accessory allows the photographer to control the spread of light from a direct light source.
The usages of the barndoor and honeycomb are limited only by your creative imagination. It ranges from hair lighting to spotlighting. Apply these accessories to control the field of light in your scene and discover new ways to highlight subjects, backgrounds, and add mood to your photographs.