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How to Use Binoculars

3,705 views · Published 29 June 2010 · 1:57 · Indexed 19 October 2026

Channel: Howcast · 2010 · Science & Technology

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Before you use binoculars, you need to adjust them for your particular eye strength.

Step 1: Adjust barrels
Hold the binoculars in the normal viewing position. Move the two barrels closer together or further apart until a single circular field comes into view.

Tip
Roll the eye cups back if you wear eyeglasses.

Step 2: Set diopter setting
Set the diopter setting to zero wile viewing a distant object. Keep both eyes open.

Step 3: Cover first objective lens
Cover the objective lens on the same side of the binocular setting as the diopter setting.

Tip
The diopter setting is usually on the right side.

Step 4: Focus
Focus on a distant object by adjusting the center focus wheel until the object appears as sharp as possible.

Step 5: Cover second objective lens
Uncover the objective lens on the diopter side, and cover the other objective lens. Observe the same object.

Step 6: Focus
Bring the object into focus by adjusting the diopter setting.

Step 7: Focus at any distance
Uncover the second objective lens. The binoculars are now adjusted for your eyes, and you can focus for any distance by simply adjusting the center focus wheel.

Did You Know?
The first binoculars appeared shortly after the invention of the telescope and were made by fastening the long tubes of two telescopes together.

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