NVS 7 4x LENS         This lens is a sophisticated optical apparatus. It is intended to convert 1x goggles into a 4x bi-ocular (binocular with a single tube). The unit utilizes advanced high precision catadioptric (mirror) lens design, which combines high performance with compact size.                     Specifications Catadioptric lens focal length, mm Visual magnification, x Relative aperture Field of view, NVS7 design Focus range, m Dimensions, mm Weight, kg     108 4 1.5 10° 10 65x82 0.220