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Binoculars glossary The following is meant to give you a better understanding of some binocular-specific technical terms to help you make the right choice.
Magnification Magnification is represented by a number and indicates how large an object appears when viewed through the binoculars. With a magnification factor of 8x, for example, a subject m away appears as if it were m away. Magnification factors from 8x to 10x allow for easy viewing, outdoors and indoors, whereas higher magnification requires an absolutely steady hand or some support for comfortable viewing.
Objective lens diameter The diameter of the objective lens — in combination with the quality of prism and lens coatings — determines how much light can be gathered to form an image. For daytime use, a lens diameter of 21—25 mm is recommended, but for low light conditions, mm provides better performance.
Field of view The real field of view is the angle of the viewing field measured in degrees and indicates how large the viewable field is at a distance of m from the point of observation.
Sometimes the field of view is also expressed as width in metres. Exit pupil The exit pupil is the diameter of the light beam visible through the eyepiece.
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It is calculated by dividing the objective lens diameter by the magnification factor. The larger the exit pupil diameter, the brighter the image seen. An exit pupil of 2—3 mm is adequate for daytime use, though with less light available, an exit pupil of 5—7 mm is preferable, e.
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Brightness Brightness is a relative value, obtained by squaring the diameter of the exit pupil. Larger relative brightness values mean brighter images.
However, this is not always the case as the amount of light the eye can absorb depends on the actual diameter of the pupil, which is different in bright and dark surroundings. How to read the numerical code The model names provide an overview about the most important features.
The description 10x42 EXPS I means that this model offers 10x magnification and the objective lens diameter is 42 mm.
Eye relief The eye relief is the distance from the rear eyepiece lens to the eye point. A long eye relief provides comfortable viewing and ease of use without image black-out. Insufficient eye relief results in a loss of field of view. For users who wear glasses, an eye relief with at least 14 mm is recommended. In order to translate scientific knowledge to people, we use different means and resources that are accessible to all citizens, using a more appropriate language, audiovisual media and online channels that facilitate understanding the scope.
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