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2023 Optics Fling

Our popular Optics Fling is back June 2-3, 2023! Join us for field trips, presentations, and a massive sale on new, used, and demo optics and birding resources and gear. 

How to Adjust your Binocular Diopter

The diopter is the mechanism that allows you to adjust the focus for each eye individually, improving your viewing experience. You can adjust the diopter on a binocular by using the small wheel or lever that's usually located on the right side of the binoculars.