provides an exceptionally true-to-life and colour accurate image. Extra low dispersion glass The extra low dispersion glass, or ED for short, is used in the manufacture of our trophy® D ED binoculars range [...] Most binoculars from Eschenbach Optik are equipped with BaK-4 prisms manufactured from barium crown glass and provide exceptional optical performance - such as a very high resolution of detail, impressive [...] farlux ® SELECTOR V, the BaK-4 prisms are enhanced even further by prisms made from high quality SK15 glass. These minimise undesired internal reflections and guarantee a pin sharp image with optimum contrast