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