New Dorr Binocular.

The classic type of Dorr binoculars is the porro prism according to the Porro principle. In this case, the light is reproduced since the first binoculars reflect the incident light and is guided by the second prism. The advantage of Dorr binoculars is the flexible installation method so even users with more narrow or wide spaced eyes will find the right model.

The binoculars allows excellent visibility for distances up porro prisms are generally cheaper than roof prisms because they are usually not watertight and have no inner focus. Binoculars with roof prism however are usually built narrower because the two prisms stand side by side and have a nearly straight light path.

The ideal for the near area which can quickly become uncomfortable with binoculars with Dorr porro prisms binoculars with roof prism are usually more elaborate and mechanically strong making them more resistant often waterproof and compact built, which is why they are usually lighter than Porro binoculars. The key figures of the field of vision are cited differently usually either as degree at the distance of as field width in meters. The field of view is the size of the diameter of the area that can be seen by the user vertical to the line of sight at a distance of meters.