The Konus Basic Series is an outstanding binocular line for the value concious customer. Designed with high quality rubber armouring to absorb shocks and Ruby Coated optics. For a crisp glare-free image. The Roof Prism compacts have central focusing include a case and instructions. They are available in an 8x 10x or 12x magnification either blister packed or boxes. Central focusing. Field of view at 1000m/1000yds: 80m/240ft. Exit pupil diameter: 2.5mm.