MESA SERIES BINOCULARSWind River MesaSeries center focus Porro prism binoculars are rugged and absolutely waterproof. Tough River armor gives you a good grip and protects from hard impacts. Porro Prism lens system transmits a three-dimensional image and gives the binoculars their classic shape. Multi-coated lenses delivers optimal light transmission. Twist-up eyecups for use with glasses. 53694 WIND RIVER MESA 8X42 Field of view in feet @ 100yards: 34.1', Weight: 26.5 oz., Length: 5.2", Eye Relief: 18mm.