Adjusting binoculars

Many people have difficulty in looking through binoculars. They may see black edges or they cannot focus them or they may encounter other problems.

This is quite understandable because you need to adjust the binoculars before you can use them effectively. To do this, follow the steps below:

1 Adjust the eye cups. Do you wear glasses or not?

Binoculars nearly always come equipped with eye cups which you can either turn inwards or outwards or fold down. These eye cups ensure that the distance between your eyes and the binoculars is correct. This is important because otherwise you would not be able to see a complete image and the image would not be bright and clear.
If you wear glasses, you should turn the eye cups inwards or fold them in. If you do not wear glasses, you need to turn the eye cups outwards or fold them out.

2 Adjusting the interpupillary distance

It is important to adjust the width of the binoculars (more specifically, the distance between the ocular lenses) to the distance between your eyes. To adjust this interpupillary distance, simply turn the two halves of the binoculars inwards or outwards until you can see a single perfect circle with both eyes separately. You can check this by closing first your right eye and then your left eye without adjusting the binoculars.

3 Adjusting dioptric correction

The dioptric adjustment setting allows you to compensate for the differences in strength between your right eye and your left eye. The adjustment setting is usually located on the right ocular lens but sometimes also behind the centre focusing wheel and sometimes you can adjust the dioptre by pulling out the centre focus knob.
To adjust the dioptre, first choose an object that is a reasonable distance away from you. Close your right eye and use the centre focusing wheel to bring the object into sharp focus. Now with your left eye closed, use the dioptre adjustment setting only (do not adjust the centre focusing wheel) to bring your right eye into sharp focus.

4 Focusing your binoculars

The only thing you still have to do is focus on the object you would like to see. Do this in a way that you can see clearly at once. If anything is slightly off centre, your eyes will attempt to compensate this and even though you may sometimes see clearly, you will find that it causes eye fatigue.

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