Bushnell Powerview 7-21x40 Zoom Binocular Product Description/ Product Details from Manufacturers https://offerup.com/redirect/?o=QW1hem9uLmNvbQ== Bushnell Powerview Zoom Binoculars are designed to provide high-quality optics in a versatile and durable format--at an affordable price. Constructed with a rugged, shock absorbing rubber armor for a comfortable, non-slip grip and equipped with the porro prism system to enhance the field of view, Powerview Binoculars are suitable for multiple applications both indoors and in nature. The 7-21x40 Zoom Powerview Binoculars provide adjustable magnification from 7x for a wide field view, up to 21x for an extremely detailed close up view. With fields of view that range from 288 to 172 feet at 1000 yards, these zoom binoculars are a great choice for field use and sporting events. Meanwhile BaK-7 prisms and multi-coated optics provide high-level image resolution and clarity, while the InstaFocus system adjusts easily as you change the zoom. Additional user friendly details include Fold-down eyecups and a tripod adaptable base. Bushnell Powerview Binoculars carry a limited lifetime warranty against defects in materials and workmanship for the original owner. Key Features: • BaK-7 prisms • Porro prism system • Multi-coated optics • Variable power magnification • Non-slip, shock-absorbing rubber armor • InstaFocus system • Fold-down eyecups • Tripod adaptable Specifications: o Variable Magnification: 7 to 21x o Objective Lens: 40 millimeters o Close Focus: 20 feet / 6 meters o Field of View at 7X Magnification: 288 feet at 1000 yards / 96 meters at 1000 meters o Field of View at 16X Magnification: 172 feet at 1000 yards / 57 meters at 1000 meters o Eye Relief: 9 millimeters o Exit Pupil at 7x Magnification: 5.7 millimeters o Exit Pupil at 21x Magnification: 1.9 millimeters o Weight: 25 ounces / 709 grams o Model: 132140 o Size Class: Standard About Porro Prism Binoculars: The prism system of a binocular reduces the size needed to contain a long optical path and turns what would be an upside-down image right-side-up. In porro prism binoculars, the objective or front lens is offset from the eyepiece. Porro prism binoculars provide greater depth perception and generally offer a wider field-of-view. From the Manufacturer Travelers, nature observers and concert goers take note: The PowerView series offers the largest line of Bushnell quality, affordable binoculars. No matter what your purpose, you'll find a variety of magnifications, styles and sizes, and fully coated optics for bright, vivid images. Standard-size models feature Insta-Focus for fast and easy focus on moving targets. The porro prism line-up provides great durability and performance in an attractive "traditional" porro prism design. Compact to full-sized, the contemporary styling houses fully coated optics. Suffice to say, images are crisp, clear and bright - even in low light. Affordable for any and all interested in magnifying life to its fullest. Specifications for this Bushnell binocular include: • Magnification: 7-21x • Objective lens: 40mm • Field of view at 1,000 yards: 288 feet at 7x, 172 feet at 21x Tech Talk Objective Lens: The diameter of the objective or front lens. The larger the objective lens, the more light that enters the binocular, and the brighter the image. Field of View (F.O.V.): The side-to-side measurement of the circular viewing field or subject area. It is defined by the width in feet or meters of the area visible at 1000 yards or meters. A wide angle binocular features a wide field of view and is better for following action. Generally, the higher the magnification, the narrower the field of view. Porro Prism System: In porro prism binoculars the objective or front lens is offset from the eyepiece. Porro prism binoculars provide greater depth perception and generally offer a wider field