Eagle Optics Ranger 8x42 Roof Prism Binoculars RGR-4208 8x42 binoculars provide 8x magnification through a 42mm objective lens. Extra-low dispersion (ED) glass to enhance resolution, color, and contrast Fully multi-coated lenses to increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces Phase correction to enhance resolution and contrast through roof prisms Dielectric prism coatings and BaK-4 prisms to optimize light transmission.