Calibrate Binoculars For Your Eyes, continued
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Step 4:
Now cover the left barrel (keep both eyes open) and turn the diopter adjustment ring clockwise to bring the lettering into focus. Be sure to leave the center focus in exactly the same position as before. Pass the point of sharp focus and then back up to where the lettering is sharpest. Uncover the left barrel and the binoculars should be in perfect focus and calibrated for your eyes.
Step 5:
Note the diopter setting because it is now adjusted to your eyes. That setting should remain constant, unless your vision changes. Some people put a piece of tape over the diopter adjustment to prevent it from shifting accidentally. Once this adjustment is set, you need only adjust the center wheel to focus both eyepieces.
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