On-camera light with barn doors included

Curtains

— adjustable plates in the form of characteristic petals that are attached to the on-camera light source and allow flexible adjustment of light accents. Barndoors are used to change the direction and distribution of the light flow - wide-open plates provide full coverage of the scene, while closed petals narrow the light flow and direct it "in the right direction" (i.e. to a specific part of the stage). Most often, barndoors are used to adjust backlight and background lighting.