Since the distance between the eyes (specifically,
the distance between the centers of the pupils)
varies among individuals, the two eyepieces of the
binoculars must be correctly aligned (adjusted).
This is called adjusting the interpupillary distance.
To adjust this distance, lift the binoculars up to your
eyes (using both hands) and look through them at
an object in the distance. Move the two halves of
the binoculars about the hinge until you see one
clear circle of image through both eyes.
Since most people have a variance of vision from
their left eye to their right eye, you must adjust the
focusing system. Use the following steps to achieve
focus: (1) Close your right eye and look through the
left side of the binoculars with your left eye at the
subject matter. Rotate the center focusing wheel
until the image appears in sharp focus; (2) Close
your left eye and look through the right eyepiece
(called the diopter). Rotate the right eyepiece until
the image appears in sharp focus. (3) Now look
through both eyepieces with both eyes open. Since
you’ve already adjusted the right eyepiece, use
only the center focusing wheel to refocus on a new
object at a different distance.
Note: Your binocular has a diopter indicator,
please note the setting for later use for faster
focus adjustment.
Hint: Eyeglasses worn for nearsightedness
should be worn when using binoculars, as
you may not be able to reach a sharp focus at
infinity without them.
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