SVBONY SV45 10-30x50 Large Caliber High Definition Waterproof Continuous Zoom Monoculars 1. Objective lens diameter: 50mm 2. Eyepiece diameter: 22mm 3. Magnification: 10-30x 4. Prism type: BaK4 5. Focusing system: center 6. Field of view: 2.4 degrees - 1.9 degrees 7. Field of view: 129 - 99 feet1000 yards 8. Exit pupil: 5mm - 1.7mm 9. Exit relief: 16mm - 16.5mm 10. Lens coating: full multilayer coating 11. Eyecup: top roll 12. Nearest focusing distance: 3m 9.8ft 13. Net weight: about 468g 14. Size: about 19 x 8 x 6cm Features: 1. High magnification 10-30x50mm zoom monocular, capture the best view in outdoor adventure 2. Fully multi-coated lenses provide increased light transmission to maximize light for the best viewing experience 3. Eyepieces and objective lenses with dust caps, high fit, effectively prevent dust from entering the monocular body 4. Adjustable eyecups that rotate up and down for comfortable viewing with or without glasses 5. Compatible with tripod adapter, allowing the use on a tripod or window bracket 6. Waterproof design, suitable for most outdoor environments 7. Concave non-slip design, designed for one-handed operation 8. Ideal for outdoor activities such as bird watching, camping, ball sports, wildlife watching, traveling, etc.