Celestron 71426 Cavalry 15x70 Binocular (Olive Green) BaK-4 Prisms: Increased contrast and resolution for sharper, more detailed images Fully Multi-Coated Optics: Increased light transmission through the optical path for brighter images with increased resolution and detail Large 70 mm Objective Lenses: Great for low-light applications Waterproof and Fogproof: Ability to use in all weather conditions. Nitrogen purged to prevent internal fogging of the lenses. Tripod adaptable: Use the included tripod adapter to attach the binocular to a tripod for extended viewing sessions Extremely Wide Field of View: Users can quickly acquire the subject being viewed, and easily follow subjects when they move Long Eye Relief: Extended eye relief provides a full field of view for eyeglass wearers