Outbound 9-27x50 Zoom Porro Prism Binoculars offer a field of view of9x - 250' and 27x - 141' at 100 yards (91.44 m). Power/magnification: 9-27x, object diameter: 50 mm. Eye relief: 9x - 0.75" (19 mm) 27x - 0.35" (9 mm). Lens coating: multi-coating. Weight: 28-oz (800 g). Material: rugged exterior, rubberized finish. Includes lens cloth, carry case and strap.