A high-quality coating delivers bright and crystal-clear images under even the worst light conditions. Coatings are applied in order to increase light transmission. In a very complicated and expensive process, thin layers of metal oxide are mounted to the prisms and lenses. The quality of a coating always depends on the number of the lenses and prisms are coated, the coating technology and the number of layers on each lens and prisms. STEINER is leading in coating technology.