The Ranger HD R/T tactical binocular combines premium optics and tactical features to create a tough, durable roof prism binocular-reliable in all conditions. HD (High Density, extra-low dispersion glass) objective lenses deliver impressive resolution and the true-to-life color accuracy essential for identifying targets at long distances in low light. Law enforcement and hunters can range objects of known dimension with the R/T Ranging reticle, which features four silhouettes to serve as a secondary ranging aid. Product Features ArmorTec : Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt. Multi-Coated: XR Fully Multi-Coated HD Lens Elements: HD Phase Correction: Coating on roof prism models enhances resolution and contrast. Rubber Armor: Provides a secure, non-slip grip, and durable external protection. Product Specifications Magnification: 10x Objective Lens Diameter: 50 mm Linear Field of View: 278 feet/1000 yards Angular Field of View: 5.3 degrees Eye Relief: 20 mm Height: 6.7 inches Width: 5.2 inches Weight: 5.2 inches27.2 oz Exit Pupil: 5 mm Interpupillary Distance: 59-75 mm Close Focus: 8.2 feet