The Godox 4-Way Barndoors for Round Head Flash Heads allows you to selectively light areas of the subject that you want illuminated, while keeping the light from areas that you don't want lit. Simply swing one or more barndoor leaves into the path of the light. The Barndoors fit the round head V1-series and the AD200 and AD200 Pro using the separately-purchased H200R adapter. It also fits the TT685 speedlight using the optional SR-1 round head adapter.