Leica Televid 25-50x Variable Aspherical Zoom EyepieceThe Leica Televid 25 50X Variable Aspherical Zoom Eyepiece is a unique, variable wide angle eyepiece, with an amazing field of view across the entire zoom range. It features aspherical optics, a weather resistant housing, and a variable focal length wide angle zoom range. The interchangeable bayonet system has an integrated, automatic eyepiece lock, which securely mounts this accessory to your spotting scope. A rubber focus dial and rotating eyecup