Design and operation of a binocular

Binoculars for observation of objects around us are as binoculars designated (Figure 7). They are like an astronomical telescope of objective and eyepiece, and are usually designed for viewing with both eyes.

Unlike the astronomical telescope but an upright image to the binoculars arise. This can be done in different ways:

In the binoculars will erect prism incorporated, through which the image is reversed. Thus one sees an upright and side correct image of the objects. Such binoculars also called prism binoculars.

In the binoculars an additional lens is installed between the objective and eyepiece. This lens acts as a relay lens , thus ensures that from the reverse and seitenvertauschten picture upright and side correct image.

As eyepiece a diverging lens is used. Such binoculars are called Dutch or Galilean binoculars. Because of their short length such binoculars are used as opera glasses.

The magnification of binoculars is usually 6 to 20 There are also binoculars, in which you can set a different magnification. In binoculars you will find most information such as 8 x 30 (see Figure 7) or 12 x 60. This means:. The binocular has an 8x or a 12x magnification. The diameter of the lens is 30 mm or 60 mm. The larger the diameter, the more light the binoculars. Therefore one selects the so-called night vision binoculars n greatest possible objective diameter. You can not with night vision devices are confused n in which electronically increases the strength of residual light.



Owner of binoculars appreciate the advantages of their instrument to appreciate. In addition to its simplicity, it is mainly its robustness with which it can score. Nevertheless, it may happen that a good piece suddenly an incorrect figure or even double vision shows. Mostly this is due to a vibration or dropping. If the objectives and eyepieces are undamaged, only the prisms desjustiert likely. This error, however, can also fix the layman, if only gone carefully works.


When the beam is no longer parallel, there are considerable aberrations. These are manifested offset images which appear noticeable, both horizontally and vertically. To control you should aim at a distant object, showing horizontal and vertical lines. For this purpose are best houses and other buildings. Then you close alternately the right and left eyes. In a maladjusted binoculars, the two images appear to jump back and forth, in the worst case one sees two separate images. Since the objectives and eyepieces immovably seated in their sockets, it is the present in the binoculars prisms that produce these effects even with minimum deformity.


The adjustment of the binoculars requires some patience. The installation on a tripod is very helpful. After the glass was placed carefully keen on the test object, you can start the adjustment. Requires use of two small fine mechanics screwdrivers. The two adjustment screws themselves are located on the housing near the eyepieces, but are often hidden by a rubber coating.


With the two screwdrivers is now slowly rotated to the adjusting screws until the two fields have been brought back to cover. This process is repeated several times to each other. To “fine tune” the object is again considered alternately with both eyes. Horizontal and vertical lines may no longer bounce, but should now while looking at no more movement can be recognized.


Although the fine details of the object appear congruent, the binoculars is optimally adjusted. The owner it is granted in order to be able to enjoy the regained optical performance of his instrument for a long time.

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