Leica 25-50x Aspheric Eyepiece Black. The integrated aspherical lenses ensure superior edge sharpness and brilliant images across the entire field of view. Together with the APO-Televid Spotting scope the Eyepiece 25-50x WW ASPH provides pictures rich in contrast and natural in colours. Besides its fine image performance the Leica Eyepiece incorporates many features for maximum robustness and protection. It can quickly and securely be attached to the spotting scope. The rubber-armoured functional components and practical rotation eyecups ensure excellent viewing comfort. In addition the eyepiece is waterproof to a depth of 16.5ft./5 m and nitrogen filled to prevent internal fogging. Specifications for Leica 25-50x Aspheric Eyepiece: Manufacturer: Leica Color: Black Objective Lens Diameter: 35 mm Package Type: Box Weight: 12.3 oz Magnification Type: Variable Field of View Linear: 95 - 135 ft at 1000 yds Magnification: 25 - 50 x ED Glass: Yes Finish: Matte Length: 4.1 in Package Contents: Leica 25-50x Aspheric Eyepiece Leica 41021: 25-50x Aspheric Eyepiece Black