On the other hand, the fully coated optics provide excellent light transmission and brightness to help you see almost any targetwhether you're looking for birds or trying to get a better view. Clear Field of view: With a 42 mm lens and 18.55 mm eyes, you can see 16 times closer and see more clearly and brightly.The larger the lens, the more light enters the binoculars and the brighter the image...clear image, no black bars, produces an ultra clear and crisp image. WATERPROOF, the mirror is filled with high purity nitrogen and is waterproof and fogproof.You can use it in rainy weather and wet environments and you don't have to worry about this item. Specifications. One-handed operation. Powerful, ultra-compact and ultra-light.Ideal for enjoying the beauty of nature, bird watching, watching sports, the almighty. Focusing mode: single focus System: Centre Prism system: Roof Magnification: 12x Field of view: 66M / 8000M Objective lens