Waterproof (up to 2m for 5 minutes) and fog-free with O-ring seals and nitrogen gas for added resistance to the elements Weight (g) 300.Multilayer-coated lenses deliver superior light transmission for bright, clear images with well-balanced colour Wide field-of-view and close-focusing distance of only 3.5m Turn-and-slide rubber eyecups with multi-click system make it easy to position your eye at the correct eyepoint Eco-glass optics, free of lead and arsenic, are used for all lenses and prisms