The highest fixed-power Brunton binocular, designed to provide the benefits of big glass without the drawbacks of big weight. The 51 mm Extra Large Objective (ELO) lens gathers more light for a brighter image, while BaK 4 prism glass and fully multi-coated lenses keep your target sharp and clear. The sleek frame and light-lightweight make the Eterna ELO an ideal tool for the long haul.