Advice for selecting and buying a pair of binoculars

The world of binoculars is not exactly easy to understand for newcomers and at the large number of technical terms, it is sometimes hard to keep track. On actually pretty small market, there are more than 30 vendors offering a total of over 1000 different binoculars. Who has no clue is quickly overwhelmed by the host.

With this article we would like to provide a guide to the side, so you do not lose track of the jungle vendors and find the right pair of binoculars for your needs. We are committed, however, requires that you already know the basics. If not, you should first read, how binoculars work .

Criteria when buying a pair of binoculars

When buying binoculars are mainly five criteria relevant for the decision:

  1. The weight
  2. The enlargement
  3. The field of view
  4. The exit pupil
  5. The glass

  1. The weight

The weight can affect in 2 directions. When transporting a very low weight is advantageous because you want to carry as little as possible while hiking. When observing a heavy binocular is advantageous because you can hold it easier still.

How heavy are binoculars? The lower limit is very light pocket binoculars at about 200 grams. Binoculars for astronomy can weigh up to over 2 kg.

  1. The enlargement

Magnification is for most users the key parameter when purchasing binoculars. It indicates to appear the wievielfache things through the binoculars enlarged. Most popular magnification factors are 8x and 10x. At 10x magnification objects appear as large as they were in 10 meters at 100 meters.

From a higher distance, it is no longer possible to keep the binoculars calm. It then requires a tripod or binoculars with image stabilization..

  1. The field of view

The field of view is defined as the diameter of the area that can be overlooked perpendicular to the line of sight at a distance of 1000 meters. It applies

The field of view is expressed in meters or as an angle in degrees, with 1 ° about 17.5 meters corresponds. Too small a field of view leads to the so-called tunnel effect – as when looking into a tunnel.

From the field of view is also dependent on whether a pair of binoculars suitable for spectacle wearers is. As wearer should be able to see at least 80% of the viewing area with glasses. The distance between eyepiece lens and eye must be greater than 14mm for this.

  1. The exit pupil

The exit pupil is defined as

One can imagine this exit pupil as a light beam of a certain size, which falls directly through the pupil to the optic nerve and produces an image.

When it is dark, then opens further the pupil of the eye and allows more light through. Thus, the higher the exit pupil, the better the binoculars is to use even in low light conditions, as more light comes through.

  1. The glass

The light must pass in a medium-sized binoculars by about 8-12 cm glass. It is therefore important that both types of glass, and the glass processing are top notch. These include various factors: Homogeneous glass quality to really ensure that the glass which has meant and expected the designer is actually processed. Other factors include the precise manufacturing of all optical and mechanical components and the complex compensation to optimize transmission and reduce reflexes. Peak values of transmission are just above 90% here. This distinguishes the complex from a simple glass. Moreover, expensive glasses are waterproof, tropicalised, using no rubber, but natural rubber (due to a possible rubber allergy) and can be repaired. However, one should the customer who is only interested in an

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