Features: Sturdy, lightweight die-cast magnesium alloy body. Environmentally friendly. Non-vinyl chloride materials used for body, eyepiece caps, case & strap. Eco-glass optics are free of lead & arsenic. Prisms feature a high-reflection silver coating to provide brighter images. Phase-correction-coated roof prisms deliver high resolution. Nikon’s original multilayer coating attains a high light transmission rate across a wide range of wavelengths & reduces flare & ghosts for excellent colour reproduction. Turn-&-slide rubber eyecups with multi-click adjustment for easier positioning of eyepieces. Every model is waterproof & fog-free, & has O-ring seals & nitrogen gas. Close focusing distance of 2.4m. Foldable design is convenient for carrying. These portable models pack powerful features into compact designs.