Features: Optimized with select glass elements to deliver exceptional resolution, cut chromatic aberration, and provide outstanding color fidelity, edge-to-edge sharpness, and light transmission. Premium anti-reflective coatings on all air-to-glass surfaces provide superior light transmission for exceptional clarity and low-light performance. Provides a secure, non-slip grip, and durable external protection. Gas-purged and o-ring sealed for fogproof and waterproof performance. Use on a tripod or car window mount. Tripod adapter required. Designed to withstand harsh weather conditions. Designed to withstand a wide range of temperatures. Desinged to withstand the highest levels of recoil and impact.