Bushnell Natureview 8x40 Porro Prism Birding Binocular Birding binoculars with 8x magnification and 40mm objective lens Multicoated optics for superior light transmission and brightness Textured center focus knob provides easy, precise adjustments Rugged, nonslip rubber armor absorbs shock; tripod-adaptable 365-foot field of view at 1,000 yards; weighs 24.8 ounces Porro prism birding binoculars with 8x magnification and 40-millimeter objective lenses BaK-7 prisms and multi-coated optics for bright, clear, crisp viewing Textured center focus knob for easy, precise adjustments 365-foot field of view at 1,000 yards; weighs 24.8 ounces Rugged, non-slip rubber armor absorbs shock; lifetime warranty