Features 1. Higher refractive index: BAK4 prisms provide a higher refractive index than BK7, helping to reduce dark edges and deliver clearer images in low-light conditions. 2. 36mm large aperture objective lens: Larger aperture allows more light transmission, resulting in brighter and clearer images. 3. HD optical glass lens: Full optical glass construction enhances light transmission, improves image clarity, and provides accurate color reproduction. 4. Lightweight and portable design: Compact and lightweight for easy handling and everyday use. Product Specification Type: Binoculars Model: 80x80 Binoculars Magnification: 8X Field of view: 8m/15000m Objective Diameter: 36mm Eyepiece Diameter: 20mm Exit Pupil Diameter: 3.75mm Eye Relief: 13.1mm Body Material: Metal barrel with rubberized protective coating Coating: Red film coating Focus Mechanism: Center focus with right-eye diopter adjustment Exterior: Non-slip rubber armor Package Includes 1 x Black soft case, 1 x Lanyard, 1 x Lens cleaning cloth, 1 x English user manual