Here you will find interesting information on the different binocular models from the last 400 years.

There are basically two types of binoculars prisms and Galileo binoculars.

The majority of binoculars sold today prism binoculars there convex lenses for objective and eyepiece lenses are installed . Prisms is because are used to correct the inverted image prisms , common name: roof edges pentaprism or penta prism.

                            Pentaprisma

                       Roof - Penta prism

The Porro prism, named after its inventor Ignazio Porro, it was patented in 1854, is the classic inverting prism in a traditional binoculars with Keplerian telescopes. Each of the built-in every part of the telescope porro prism is usually made ​​up of two simple rectangular reflection prisms (so-called half-prisms), which happens to be from the beam path after the other and each causing a 180 ° rotation of the image. The correct side, but upside-down picture produced by the Kepler telescopes is raised in this way. (Source: wikipedia)

Galileo binoculars are small and lightweight binocular binoculars after the Galilean telescope principle. They contain per beam path only a convex objective lens and a concave eyepiece lens , which directly generate an upright image . Inverting prisms are therefore not necessary .
 

                                                                        Beam path in a Galilean telescope

Of course there are many more binoculars and telescope designs , but the sitter we binoculars designs are the most popular models of binoculars .