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.