The ACULON A211 7x35 binoculars feature 7-power multicoated lenses and 35mm objectives fabricated with Nikon?s exclusive lead and arsenic free Eco-Glass?. The BaK4 Porro prism systems within all ACULON A211 binoculars deliver a high quality image under a multitude of lighting conditions, making these binoculars effective from dawn till dusk. Featuring aspherical multicoated lenses and BaK4 high index Porro style prisms Central Focus Turn-and-slide rubber eyecups Ergonomic lightweight design Durable and protective rubber-armored coating Manufactured responsibly with lead and arsenic-free Eco-Glass 35mm objective