Calibrating
Calibrate Binoculars For Your Eyes
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Most binoculars have a center focusing wheel that adjusts the focus of
both eyepieces simultaneously and a separate diopter adjustment that
allows you to focus one eyepiece independently, to make up for the
differences in vision between your left and right eye.
To determine the correct diopter adjustment on your binoculars, stand
about 30 feet away from a sign with clear lettering, making sure that
it is in the middle of the focal range of your binoculars.
Follow these five steps:
Step 1:
Notice that the two binocular barrels pivot on a hingepost allowing the eyepieces to fit your eyes comfortably. Facing the sign, spread the barrels apart as wide as you can. Then, put the binoculars to your eyes and press the barrels together until the two images converge into one. If you cannot push the eyepieces close enough together to see through comfortably, reject those binoculars; the "interpupillary distance" of that model may be too wide to accommodate the narrowness of the space between your eyes. The number (angle) indicated on the hinge post will always be the same for your eyes, on any pair of binoculars.
Step 2:
Turn the center focusing wheel counterclockwise, as far as it will go. Locate the diopter adjustment ring.
On most binoculars it is a ring on one of the eyepieces (usually the right one) that is marked with calibrations and can move independently. (Note that some binoculars have a separate knob in the center or another mechanism for diopter adjustments; if so, consult the manufacturer's instructions.) Turn the diopter adjustment ring in a counterclockwise direction untiI it stops. Now both eyepieces should be out of focus.
Step 3:
Facing the sign, lift the binoculars into position and cover the end of the right binocular barrel. With both eyes open, turn the center focusing wheel until the lettering comes into sharp focus. To be sure you have the sharpest possible focus, pass the sharpest point and then back up to find it again.
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