To build optical systems providing maximum image quality and performance, glass types used to be required whose optical properties are only achieved by adding lead, arsenic or other metals. These additions have a high specific density and the binoculars, especially models with high magnifications and twilight performance, are correspondingly heavy. In other words, new solutions had to be found.
After many years of intensive cooperation with Zeiss optical scientists, Schott Glas, Mainz, a company of the Carl-Zeiss-Stiftung and the world's biggest special glass manufacturer, has now succeeded in producing glass types without arsenic and lead, providing the optical properties required for systems of maximum image quality. The new glass types from Schott are markedly lighter, and their processing does not require the disposal of environmental pollutants. This success laid the foundations for the Advanced Optics System (AOS) from Carl Zeiss which has resulted in new optical systems with exceptional qualities.