Swarovski 10x42 EL Range Binocular / Laser Rangefinder Magnification: 10x Effective objective lens diameter: 42mm Exit pupil diameter: 4.2mm Exit pupil distance (eye relief): 17.3mm Field of view (ft/1000 yds / m/1000 m): 330 / 110 (ft/1000 yds / m/1000 m)6.3 deg.