F&V BK4-1 Barndoor Kit 4 Leaf with Frame for K4000 SE, Z400S Soft, and Z800S SoftF&V BK4 1 Barndoor Kit 4 Leaf with Frame for K4000 SE, Z400S Soft, and Z800S Soft F&V SKU: 10311002 Helix SKU: FV10311002 Overview Control the light spread of your Z400S Soft or K4000 SE with this four leaf barn door kit. The kit includes the top, bottom, and two side barn door flags. The flags easily attach to the included FAF 1 Filter Frame with thumb screws. The FAF 1 uses the new mounting system found on the Z400S Soft and K4000 SE lights. The