Featuring Bak-4 roof prisms, the Sightmark Solitude 12x50 binocular is equipped with superior glass for a clearer and better quality image. The Bak-4 roof prism system features a straight through light system, which achieves better light transmission and allows for a more compact design. From early dawn to late dusk, the optimum color fidelity and clarity of image enhances any viewing experience, while a generously long eye relief provides comfortable viewing. The twist up e