"Celestron SkyMaster 15-35X70 Brand New Includes Limited Lifetime Warranty, The Celestron 71013 SkyMaster 15-35X70 Zoom binocular can be used for terrestrial or astronomical viewing - it's large, powerful and fun to use. This large aperture binoculars are a phenomenal value for high performance binoculars. It has a fully multi-coated optics for enhanced contrast and its BaK4 prisms provide good light transmission, excellent sharpness and clarity . It comes with a diopter adjustment for fine focusing. This binocular is water-resistant and has an adaptor allowing it to be fitted to a standard tripod fitting.Celestron has designed and engineered the larger SkyMaster models to meet the special demands of extended astronomical or terrestrial viewing sessions.Long eye relief ideal for eyeglass wearers and a carrying case included for travel and safe storage. 71013 Features: Multi-Coated Optics -for Sharp, Clear Views, High-Quality BaK4 Prisms, 15x-35x Zoom Magnification, Large 70 mm Objective Lens - Offers Maximum Image Brightness in Low-light & Long-range Conditions, Ultra Sharp Focus Across The Field of View, Suitable for Terrestrial or Astronomical Viewing, Large Aperture - Perfect for Low Light Conditions & Stargazing, Diopter Adjustment for Fine Focusing, Long Eye Relief Ideal for Eyeglass Wearers, Water Resistant, SKU : 71013, Specifications: Objective Lens Diameter (mm) : 70 mm, Magnification (x) : 15-35x, Angular Field of View : 2.2, Linear Field of View : 15x: 111 ft. @ 1, 000 yds. 38.4m @ 1000m, Close Focus Distance : 73.8 ft. / 22.5m, Exit Pupil (mm) : 4.7 @ 15x 2.0 @ 35x, Eye Relief (mm) : 20.3 mm @ 15x, Optical Coatings : Multi-Coated, Weight (oz) : 53 oz (1503 g), Prism Glass (Type) : BaK-4, Twilight Factor : 37.41, Relative Brightness : 12.25, Weatherproof : Water Resistant, Tripod Adaptable : Yes, Includes: Strap, Carrying Case, Tripod Adapter, Lens Caps"