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Individual Focus: (BN40, BN50, BN20C) The advantage of individual focus binoculars is that you can pre-focus the binoculars, allowing you to see objects in low light without further adjustments for distances of 40 yards to infinity. To focus using individual focus system: cover one lens or close one eye at a time (it is better to cover a lens and leave both eyes open) and rotate the opposite eye piece focusing (diopter) ring until the image is sharp, then repeat for the other side.
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