Eyepiece adjustment

The first thing everybody does when picking up a pair of binoculars, is to adjust the two barrels of the binoculars to fit the distance between his eyes. If you do not do this, the binocular is useless. The two barrels of the binoculars have to be adjusted to fit the distances between the pupils of your eyes, called interpupillary distance (IPD). These have to be adjusted until you have one single circular field of view.

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