Feature A Fully Multi-Coated and BaK-4 Prism Maximize Light Transmittance, Delivering Bright and Clear Images A Heavy-Duty MagAlu Alloy Offers High Strength, Rugged Durability, Effectively Resisting Shock and Drops A 50mm Large Objective Lens Enhances Light Gathering Capabilities, Ensuring Visibility in Dim Conditions A Durable Rubber-Armored Housing Provides a Non-slip and Comfortable Grip, Even in Wet Conditions A Versatile 10x50mm Configuration Offers Detailed Views While Maintaining Excellent Stability Specification Magnification: 10x Objective Lens: 50 mm Exit Pupil: 4.2 mm Eye Relief: 18 mm / 0.71 in Light Transmission: N/A Min Focal Distance: 10 m Lens Coating: Fully Multi-coated Prism Glass: BaK-4, Porro Prism Prism Coating: N/A Focusing System: Central Linear Field of View: 299.9 ft @ 1000 yds Linear Field of View: 100 m @ 1000 m Angular Field of View: 5.7 Adeg Diopter: Right Eyepiec Diopter Compensation: -4 to +4 Waterproof: IPX4 Material: Magnesium-Aluminum Alloy Housing Material: PVC Operating temperature: -20 to +60 Storage temperature: 10-25 Size: 185 x 192 x 94.3 mm Weight: 850 g / 30 oz Eyecups: Twist-up Items in the Package: Pouch, Shoulder Strap, Lens Caps, Instructions, Cleaning Cloth, etc. Size