Whilst less compact, than the more commonly used Schmidt-Pechan design of roof prism, all surfaces on the Abbe-Koenig prisms reflect 100% of the light that hits them and thus they do not require highly reflective coatings to be used. This produces a 180° image rotation (without changing the image's handedness) and allows use of the prism as an image erecting system. The overall effect of the internal reflections is to flip the image both vertically and horizontally. The light is then reflected from the opposite 30° face and exits, again at normal incidence.
Light enters one face at normal incidence, is internally reflected from a 30° sloped face, and then is reflected from a "roof" (German Dach) section (consisting of two faces meeting at a 90° angle) at the bottom of the prism. The prism is made from two glass prisms, which are optically cemented together to form a symmetric, shallow V-shaped assembly. This will in tern help you make an informed decision when purchasing the correct binoculars for your specific needs.Īn Abbe-Koenig prism is named after Ernst Abbe and Albert Koenig and is a type of reflecting roof prism, used to invert an image (rotate it by 180°), but not change the handedness and are thus used in binoculars and some telescopes. Here are the most commonly used terms when talking about binoculars and what they mean. If you don't know your Diopter Adjuster from your Ocular Lens or don't know the difference between Porro Prism and Roof Prism binoculars, this article will help.
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