Celestron 71380 Granite Series 9 x 33 Roof Prism Binocular (Black)

Prime index ED Glass objective lenses for the truest color rendition.
Fully Broadband Multi-Coated lenses –supplies maximum throughput light transmission with the easiest levels of contrast. Celestron Broadband coatings supply excellent natural color fidelity and vivid color saturation.
Section Coated BaK-4 Prisms with Dielectric Prime Reflectivity Coatings
Water resistant & Fogproof -Nitrogen purged.
Rubber Armored– for defense; Ergonomic features such as open bridge body with thumb indentations & finger ridges to forestall slipping.; Metal Focal point Knob, Diopter Ring, and Twist-Up Eyecups -for long life and precision movement