The top models in our lineup have several features that make them the very best binoculars available, including a bright 42mm objective diameter. • Lighter weight (795g). • Environmentally friendly. Non-vinyl chloride materials used for body, eyepiece caps, case and strap. Eco-glass optics are free of lead and 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 and reduces flare and ghosts for excellent colour reproduction. • Turn-and-slide rubber eyecups facilitate easy positioning of eyes at the correct eyepoint. • Every model is waterproof and fog-free, and has O-ring seals and nitrogen gas.