Extra-low dispersion (ED) glass for chromatic aberration compensation and brighter, clearer viewing Phase-correction-coated roof prism for high resolution Dielectric high-reflective multilayer prism coating on roof prism for the brightest view (straight models only) All lenses and prisms are multilayer-coated for the brightest images Waterproof (up to 2m/6.6 ft. for 10 minutes) and fog free with nitrogen gas and O-ring seals (body-and-eyepiece joint is water-resistant) Stylish design Three tripod mount screw holes provided for flexible mounting; optimum balance achieved through CAE (Computer Aided Engineering) Seven eyepieces exclusively for EDG Fieldscopes are optionally available Built-in sliding hood protects objective lens |