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A typical Porro prism binoculars design
Binoculars, by Father Chérubin d'Orléans, 1681, Musée des Arts et Métiers

Binoculars, field glasses or binocular telescopes are a pair of identical or mirror-symmetrical telescopes mounted side-by-side and aligned to point accurately in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most are sized to be held using both hands, although sizes vary widely from opera glasses to large pedestal mounted military models.

Unlike a (monocular) telescope, binoculars give users a three-dimensional image: for nearer objects the two views, presented to each of the viewer's eyes from slightly different viewpoints, produce a merged view with an impression of depth.


Binoculars sections
Intro   Optical designs    Binoculars with Keplerian optics    Mechanical design    Optical coatings    Applications    List of binocular manufacturers    See also    References   Further reading   External links   

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