Magview B1 Binocular Adapter. No longer do you have to make the choice between stomping around your spotting scope to film or leaving it behind but missing the opportunity to capture footage at a distance. Impossibly small yet impressively strong the B1 Adapter seamlessly integrates with your binocular of choice. Slip it onto the eyecup and tighten the retaining screw. Thats it. A set it and forget it design does not impede normal use of the binocular making this tool an efficient and practical addition to your kit. Together with the MAGVIEW Phone Plate this system creates the ultimate light and fast digiscoping platform for steady sharp photo and video every time. Please note the MAGVIEW Phone Plate is not compatible with wireless phone chargers Specifications for Magview B1 Binocular Adapter: Manufacturer: Magview Fabric/Material: Polymer Width: 5.125 in Height: 5 in Depth/Thickness: 2.5 in Features of Magview B1 Binocular Adapter Rare-Earth Magnets Built Into Adapter B1 Fits eyepiece sizes 38.5mm-43mm (1.5in-1.7in) Package Contents: Magview B1 Binocular Adapter x1 MAGVIEW Phone Plate Magview 82013: B1 Binocular Adapter