Binoculars are one of the handiest and most widespread of all optical instruments. Binoculars are used by the astronomer, hunter, fisherman, boater, sports fan, and traveller.

Binoculars are really just two small telescopes mechanically linked together. The main features of Binoculars are a prime focal length, an objective lens, an ocular (eyepiece), an exit pupil etc.

Binoculars are commonly described with the help of numbers, such as "7x50". The first of these numbers means magnification of the Binoculars. Common Binoculars magnifications are 6x, 7x, 8x, 9x, and 10x. The second number refers to the diameter of the objective lens of the Binoculars in mm. Thus in "7x50," the "50" means that the front lenses of the Binoculars are 50mm in diameter.

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