Designed specifically for serious birders and naturalists, the NatureView 8x 42mm Roof Prism Binoculars from Bushnell offer ultra close focus capabilities that allow you to take in the details without getting pecked in the head. Thanks to premium, BaK-4 prism glass, these binoculars provide high-level image transmission. Meanwhile, the fully multi-coated lens surfaces reduce light loss and glare due to reflection for brighter, higher-contrast images and reduced eyestrain. Extended eye relief delivers greater comfort--especially for eyeglass wearers during long observation periods. And, focus adjustments are simple, thanks to the textured center focus knob. The roof prism system in these binoculars creates a sturdier, more streamlined build that is both waterproof and fogproof. Finally, non-slip rubber armor provides a stable grip and adds further protection for the optics. Built to last, the binoculars carry a limited lifetime warranty from Bushnell.