Celestron 71350  Cypress 8x25 Binocular (Black) BaK-4 Prisms: Increases contrast and resolution for sharper more detailed images Multi-Coated Optics: Increased light transmission through the optical path for brighter images Waterproof and Fogproof: Nitrogen purged to prevent internal fogging of the lenses Compact and Lightweight: Reverse porro design fits in a pocket or glove box. Easy to carry on long excursions. Wide Field of View: Allows user to quickly acquire the subject being viewed and easily follow subjects when they move Twist-up Eyecups: Multiple stops for correct positioning of the eyes for comfortable viewing with or without eyeglasses Polycarbonate frame: Strong and durable polycarbonate body. Provides structural integrity while keeping the weight to a minimum.