Spirit ED's light transmission of up to 90 percent results in a near-perfect viewing experience. Its advanced lens and prism design with ED glass means you'll get up-close and personal with nature, unveiling details in a way you never thought possible. Spirit ED boasts user-friendly features, too, with a lightweight, comfortable-to-hold body design, twist-out eyecups for long eye relief, large focus adjustment wheel and 100 percent waterproofness, so the weather will never slow you down.