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Binocular telescopes, or binoculars, (also known as field glasses) are two 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 adequate to be held using both hands although there are much larger types.

Unlike a monocular telescope, binoculars give users a three-dimensional image: the two views, presented from slightly different viewpoints to each of the viewer's eyes, merge to produce a single perceived view with a sensation of depth, allowing distances to be estimated. Binoculars are also more comfortable for viewing, as they negate the need to close or obstruct one eye to avoid confusion. It is also easier and more comfortable to steadily hold and move a binocular than a single tube, as the two hands and the head form a steady three-point platform.

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