Description: Design: 2.5x17.5mm Miniature . With finger buckle, easy to held. Powerful, -compact and -lightweight, rotary Multi coated optics with transmission and brightness. Easy to use: You can easily adjust the focus wheel with hand, making it the most user-friendly spotting scope. The eyecup can be twisted up and down easily and quickly Widely Used: Suitable for watch the game, concerts, tourism, observe animal lovers, etc. Specification: Packing List: Miniature Focusing method: Rotary focus Eyepiece diameter: about 8mm Objective lens diameter: about 17.5mm Magnification: 2.5X Field of view distance: 8m/600m Field of view angle: 6.5 degrees Exit pupil diameter: 16mm Exit pupil distance: 13.5mm Size Chart: 35x22mm/1.38x0.87inch Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful shopping! rotary focus Compact Mini Telescope Handheld 2.5 17.5mm camping gift handheld the most spotting