Bushnell 8-16 x 40 Zoom Powerview Roof Prism Binocularbr Standard-sized variable power binoculars with 40-millimeter objective lenses and roof prism system br 8 to 16x zoom magnification offers both wide angle overviews and detailed close ups br BaK-7 prisms and multi-coated optics for high-quality resolution and image clarity br Rugged shock-absorbing non-slip rubber armor center focus knob br Limited lifetime warranty