Alpen Optics Binocular Tripod Adapter For the outdoor enthusiast who tires of holding binoculars up to the eyes, the Alpen Binocular Tripod Adapter is the ticket to a better experience and longer viewing in the field. While this adapter is designed to work with Alpen binoculars that have a narrow bridge, it works with any binocular that has the front adapter hole. It connects to any tripod equipped with a 1/4-20 screw.