Fangrui Product Details 1. Svbony Sv45 10-30x50 Large Caliber High Definition Waterproof Continuous Zoom Monoculars 2. Objective Lens Diameter: 50mm 3. Eyepiece Diameter: 22mm 4. Magnification: 10-30x 5. Prism Type: Bak4 6. Focusing System: Center 7. Field Of View: 2.4 Degrees - 1.9 Degrees 8. Field Of View: 129 - 99 Feet1000 Yards 9. Exit Pupil: 5mm - 1.7mm 10. Exit Relief: 16mm - 16.5mm 11. Lens Coating: Full Multilayer Coating 12. Eyecup: Top Roll 13. Nearest Focusing Distance: 3m 9.8ft 14. Net Weight: About 468g 15. Size: About 19 X 8 X 6cm 16. Features: 17. High Magnification 10-30x50mm Zoom Monocular, Capture The View In Outdoor Adventure 18. Fully Multi-coated Lenses Provide Increased Light Transmission To Maximize Light For The Viewing Experience 19. Eyepieces And Objective Lenses With Dust Caps, High Fit, Effectively Prevent Dust From Entering The Monocular Body 20. Adjustable Eyecups That Rotate Up And Down For Comfortable Viewing With Or Without Glasses 21. Compatible With Tripod Adapter, Allowing The Use On A Tripod Or Window Bracket 22. Waterproof Design, Suitable For Most Outdoor Environments 23. Concave Non-slip Design, Designed For One-handed Operation 24. Ideal For Outdoor Activities Such As Bird Watching, Camping, Ball Sports, Wildlife Watching, Traveling, Etc.