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Glossary > Binoculars > Capacity

Glossary | Binoculars | Capacity

Performance data enables binoculars to be compared with one another.

More information:

Dioptre compensation

Dioptre compensation can be used to compensate for differences between the right and left eye.

Exit pupil

Relates to the beam of light emitted by the eyepiece. The exit pupil is closely associated with the brightness of a pair of binoculars.

Eye relief

The eye relief specifies the maximum distance from the eyepiece at which the entire field of view can still be seen. A suitable distance for spectacles wearers is >16mm.

Eyepiece cups (1)

The eyecups are located on the eyepieces and protect they eyes from stray light.

Focusing system (3)

Binoculars are focused by focusing on the object, or rather the eyes of the observer.

Front lens diameter (1)

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

Glass material (1)

A distinction is made between different glass materials. Through the use of special types of glass, the optical image can be optimized.

Interpupillary distance

The interpupillary distance indicates how far the eyepieces or tubes can be pushed together or pulled apart. This is an important indication, since each person has a different interpupillary distance.

Lens coating (1)

Coatings on optical surfaces have the job of minimising annoying reflections. In this way light transmission and contrast is increased.


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.

Type of build (3)

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