15 X 50 IS All Weather Features Built-in Image Stabilizer provides shake-free performance 15x high magnification ratio Multi-coated, Ultra-low Dispersion (UD) glass elements for exceptional image quality Doublet Field Flattener for sharp, distortion-free images from edge to edge Extra bright, large diameter 50mm objective lens 15mm Long-Eye Relief ensures comfort Weather-resistant construction with non-slip rubberized grip High-Power, Large Binoculars Perfect for Star Gazing or When You Can't Get Close Enough! The 15 x 50 IS All Weather binoculars with one-touch Image Stabilizer technology instantly compensates for binocular shake. Large diameter 50mm front objective lenses accommodate a wide range of activities from sports to astronomical observation. A multi-coated, Ultra-low Dispersion (UD) lens element in each objective section delivers outstanding image contrast, sharpness and color clarity. To accommodate eyeglass wearers, 15mm Long-Eye Relief provides greater viewing comfort, and the ergonomic design makes holding easily. An optical anti-fog eyepiece prevents condensation and fogging in foul weather. Binocular Specifications Type Prism Binoculars Magnification 15x Objective Lens Effective Diameter 50mm Filter Size 58mm Real Field of View 4.5° Apparent Field of View 67.5° Objective Lens Construction 4 elements in 3 groups (including protective glass) Eyepiece Lens Construction 7 elements in 5 groups Exit Pupil Diameter 3.3mm Eye Relief 15mm Prism Type Porro II Eye Width adjustment 58mm ~ 76mm Focusing Method Manual focusing by turning the focusing knob Dioptric Correction ±3.0 diopters Closest Focusing Distance 6 m/19.7 ft. Image Stabilizer Vari-Angle Prism Correction angle ±0.7° Tripod Socket Provided Power Source 2 x AA Dimensions 152 x 193 x 1180mm/6.0 x 7.6 x 3.2 in. Weight 1180g/41.6 oz. (excluding batteries)