Frontier 8x42The Frontier¢â series of compact binoculars takes incredible BaK-4 prisms and multicoated lens and transforms them into a phenomenally performing optic. SPECIFICATIONS Lens diameter, mm 42 Magnification, x 8 Eye relief, mm 17 Exit pupil diameter, mm 5.25 Real angle of view, degrees 7.5¡Æ Field of view at 1000 yard distance, yard 143 Focus range, yard 2 to inf. Twilight factor 18.3 Diopter adjustment, dptr ¡¾ 4 Interpupillary distance, mm 55−73 Operating temperature,¢ªF -22¢ª to +105¢ª Dimensions, in 5.3¡± x 4.9¡± x 2.0¡± Weight (w/out packaging), oz 24.6 The Frontier¢â series of compact binoculars takes incredible BaK-4 prisms and multicoated lens and transforms them into a phenomenally performing optic. These incredible binoculars, while providing maximum light transmission and optimal brightness, let any outdoorsman or sports aficionado explore and enjoy their surroundings to the fullest extent. From early dawn to late dusk, the optimum color fidelity and clarity of image enhance any viewing experience, while a generously long eye relief reduces potential eye strain. Every Frontier binocular boasts a rugged, yet lightweight, rubber armored body that is nitrogen filled for the highest level of waterproofing and fogproofing possible. The Frontier¢â series is taking the ¡°Frontier of Optics¡±¢â to a whole new level. FEATURES Rubber armored body Multicoated lenses BaK-4 roof prisms Central focusing knob Nitrogen filled and O-ring sealed for 100% waterproof / fogproof / dustproof construction