Aculon A211 10 22x50 zoom binoculars are designed to be as light as possible along with excellent ergonomics Easy to reach fingertip zoom control knob allows for quick and easy adjustment of the binoculars magnification from 10 up to 22 power. Interpapillary distance adjustment (millimeter) - 56-72 Turn and slide rubber eyecups allow for comfortable viewing during extended periods of use; Minimum focus distance 49.2 feet / 15 meter Multicoated eco glass lenses deliver a bright and clear image in most lighting conditions; Field of view 1000 meter (meter/feet) 66/199; Apparent field of view (°) 36.7; Real field of view (°) 3.8 A durable rubber armored coating ensures a non slip grip, even in wet conditions; Exit pupil is 2.3 - 5 millimeter