The Nikon Monarch 3 10 x 42 Roof Prism Binoculars feature a phase-correction, high-reflective prism coating for clear, high-contrast images and color and multicoated, precision-aligned optics to help promote light transmission. The center-focus knob offers quick and precise adjustments, and the click-stop eyecups and long eye relief allow for clear, comfortable viewing. These binoculars are O-ring sealed and nitrogen filled for waterproof and fog-proof performance, and the nonslip rubber armor provides a comfortable grip.