Features: Optimized glass elements deliver exceptional resolution, cut chromatic aberration, and provide outstanding color fidelity, edge-toedge sharpness, and light transmission. Anti-reflective coatings on all air-to-glass surfaces provide increased light transmission for greater clarity and low-light performance. Valued for greater durability and a more compact size. Provides a secure, non-slip grip, and durable external protection. Gas purged and o-ring sealed for fogproof and waterproof performance in all conditions. Compatible with a tripod adapter, allowing use on a tripod or car window mount Twist up and down for comfortable viewing with or without eyeglasses. Adjusts the focus of both binocular barrels at the same time. Adjusts for differences in a user's eyes. Located on right eyepiece. O-ring seals prevent moisture, dust and debris from penetrating the binocular for reliable performance in all environments. Nitrogen gas purging prevents internal fogging over a wide range of temperatures. Designed to withstand the highest levels of impact.