The Steiner Observer 20x80 Large-fashioned glass with a high-end look for bright, high-contrast images with natural color rendering. Once set, the Steiner Sports-Auto-Focus delivers, always razor-sharp images from 20m to infinite-without focal. Durable macrolone housing made of polycarbonate. The non-slip NBR-Longlife rubber reinforcement resists oil. Acid and weather influences. Insensitive to rough conditions for reliable use over generations. A nitrogen pressure filling is a foggy or the formation of condensation inside the binoculars Is with this high-tech solution of Steiner completely excluded. Even temperature fluctuations from -20 ° C to +60 ° C do not affect the functionality of a nitrogen filled Steiner-Fernlasses. Thanks to the 2-way valve technology, maintenance of the b.