Godox Barndoors for FLS10 Lens with Beam Cutting, Light Control, and Light Spill Prevention (Black)Designed for the FLS10 fresnel lens, the Godox Barndoors in Black allow you to shape and control the direction and spread of the light beam. They can be used to cut the beam, so the light falls on one specific area, and the barndoors also prevent light spills that can cause unwanted lens flare. Its foldable design helps with easy carrying.