Featuring Bak-4 roof prisms and a 10x magnification, the Solitude 10x42 Binocular is equipped with superior glass for clearer imaging and long-distance viewing. The Bak-4 roof prism system features a straight-through light system, achieving better light transmission and allowing for a more compact design. From early dawn to late dusk, the optimum color fidelity and image clarity enhance any viewing experience, while a generously long eye relief provides comfortable viewing. The Solitude 10x42 binocular boasts a rugged, yet lightweight, rubber-armored body that is nitrogen-filled and O-ring sealed, making it waterproof and fog proof. The twist-up eye cups on the Solitude 10x42 binocular provides a custom fit and helps correct eye relief, even for individuals who wear eye glasses. Featuring a dust proof construction, the Sightmark Solitude 10x42 Binocular is exceptionally reliable for a lifetime of use.