These f10 barndoors are compatible specifically to the aputure's 10 25cm glass fresnel lens modifier and the f10 fresnel. They include a black reflector dish negative reflector for precise shadows, where fine adjustments can be made with the four additional side leaves for a full 8 leaf barndoor set. The black reflector dish works by minimising the size of the light source to that of the led chipset, creating a much sharper, clean cut light. The f10 barndoors are making a real statement within the modular led industry, standing as a key industrial grade accessory for lighting engineers. Instead of the wire clamp mechanism usually found on smaller barndoors, the f10s feature a heavy duty, durable drop in latch mechanism. The f10 barndoors are incredibly reliable, at home on any film set.