Bushnell H2O Waterproof/Fogproof Compact Inverted Porro Prism Binocular, 8 x 26-mm, Black 100% waterproof, O-ring sealed and nitrogen purged for reliable, fog-free performance BaK-4 prisms and multi-coated optics offer crisp clear images with improved light transmission Non-slip rubber armor and Soft Texture Grip absorbs shock and provides a firm grip 8x magnification and 26mm objective diameter; 8.5-foot close focus distance; 15mm eye relief Large center-focus knob for easy adjustments; Twist-up eyecups; Limited lifetime warranty