Describes the internal structure of a pair of binoculars, thereby further subdividing the different types.

The first number in the binoculars’ model number represents the magnification. It specifies how much larger an object appears compared to when viewed with the naked eye.

The second specification in the binoculars’ model number is the front lens diameter. The larger it is, the more light the binoculars collect.

Binoculars can be equipped with additional functions such as an image stabilizer or a zoom.