Warne Mfg MV82013: The B1 Adapter seamlessly integrates with a binocular of choice. Slip it onto the eyecup and tighten the retaining screw. A set it and forget it design does not impede normal use of the binocular, making this tool an efficient and practical addition to kits. This system creates the ultimate light and fast digiscoping platform for steady, sharp photo and video, every time.