BK-7 porro prism. Objective Lens 50mm. 16x magnification. Shock-absorbing rubber armor provides protection. Offers greater depth perception and a wider field of view. Bird watching, hunting, hiking, sporting events, and much more come to life with the Barska 16x50 Level Binoculars. 16x magnification, 50mm objective lenses, fully multi-coated optics, and a BK-7 prism combine to give you excellent contrast and clarity while the ergonomic design and non-slip, shock-absorbing rubber armor gives you a solid grip. Use the large center focus knob to easily focus on your target while the fold down eyecups make it simple for people with and without eyeglasses to enjoy these binoculars.