Filmmakers can use the Cine Lens Clamp-On Adapter Ring from Kondor Blue to secure their Kondor Blue matte box with a 95mm opening onto a lens with a 80mm outer diameter. This durable aluminum adapter clamps onto the outside of your lens and there is a safety groove that catches inside the matte box opening to hold it in place. The ring is both lightweight and sturdy, blocking light from seeping in behind your matte box.