Leupold Field Clamp Binocular Tripod Adapter - Call wind and impacts with both eyes open. The Field Clamp binocular tripod adapter offers superior stability when you're dialing in shots while looking through your binos. Its quick-clamp design with non-marring rubber pads is perfect for any binoculars 20-56 millimeters in diameter. Clamp Design; Aluminum Body; Arca-Swiss Compatible Base; Non-Marring Rubber Pads;