Bird watchers use binoculars at a BWD Reader Rendezvous. Photo by Bill Thompson, III

How to Use Binoculars: Helpful Tips for the Field

The most useful binoculars for bird watching incorporate a few basic features. They have a central focus wheel and a diopter focus adjustment. The diopter is often part of the right-hand eyepiece on a binocular. The purpose of the diopter is to compensate for the differences between your two eyes (because no two eyes are …

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