The grey 15x51 Eterna ELO Binocular from Brunton is a fixed-power binocular designed for long-range glassing. Fully multicoated optics and phase-corrected BaK-4 prisms transmit bright images that are as rich in detail as they are in contrast. This model of the Eterna series is configured with 51mm Extra Large Objective lenses that deliver an impressive light gathering ability that is most useful in low-light conditions. A long eye relief, ergonomic composite body armor, and weatherproof construction make the Eterna a full-featured binocular ready for years of adventures. Brunton Outdoor Group has been designing and manufacturing outdoor sporting equipment since 1894; whether you are a bird watcher, hunter, or hiker, Brunton has been making gear for nature enthusiasts like you for over a century.