The Fieldscope EDIII scope is waterproof (up to 2m/6.6 feet for 5 minutes) & fog-free with O-ring seals & nitrogen gas. It also features Extra-low Dispersion (ED) glass for chromatic aberration compensation & brighter, clearer viewing. All lenses & prisms are multilayer coated for the brightest images. The scope has a built-in type slide hood & comes complete with case. Eight different eyepieces are compatible with the EDIII.