Wind River Wilderness Optics are engineered and manufactured to standards set and monitored by the design engineers at Leupold's Oregon factory. The goal is to provide you with reliable performance at a reasonable price. Wind River Wilderness optics has always been favorably compared by outdoors writers with some of the world's best names in optics, though they cost far less. Well-designed, built solid, 100% waterproof in any condition, and with bright, sharp sight pictures, Wind River Wilderness optics will be a valuable part of any hunting experience for years to come. The angled eyepiece on the powerful Wind River Sequoia 15-45x60mm Angled spotting scope makes it easy to use from a variety of positions. One hundred percent wilderness ready, like all Wind River products, it also gives you long eye relief and roll-down eyecups which make it easy to use for extended periods, even with glasses. The rubber, shock-absorbing armor gives it additional durability. Actual Magnification: 15x-45x Linear Field of View (100 Yards): 13.1-6.3ft (4.4-2.1m) Angular Field of View: 2.5-1.2 degrees Weight: 35.1 ounces (995 gram) Length: 12.5 inches (31.7 cm) Objective Aperture: 60mm Twilight Factor: 30.0 - 52.0 Exit Pupil: 3.9 - 1.3mm Eye Relief: 16.5 - 13.0mm Close Focus Distance: 29.9 ft (9.1 m)