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Focus your binocular
For the best view, use the center focus and diopter to adjust for
differences in vision in each eye. Choose an object that is about 20
yards away from you and perform this two-step process:
1. Adjust the center focus. Close your
right eye or cover the right objective
lens with your hand. Look at the object
with your left eye and adjust the center
focus wheel until the image is in focus.
Note: Keep the center focus in this
position as you adjust the diopter.
2. Adjust the diopter. Pull the diopter
ring up toward the ocular lens to
unlock its position. Close your left eye
or cover the left objective lens with
your hand and rotate the ring until the
object is in focus. Push the ring back
down to lock the diopter—be sure to
record the setting so you can go back
to it if someone changes the diopter
setting.
After setting the diopter you only need to use the center wheel to
focus your binocular. Note: If your vision changes, you may need to
repeat this process.
Caution:
Binoculars are not intended for looking at the sun or other intense
light sources. Such viewing could damage the retina and cornea of
your eyes—even to the point of causing blindness.