Eyepiece and Diopter Adjusters

Why Setting the Diopter on Binoculars Matters Most people blame blurry binoculars on weak lenses, bad weather, or “cheap optics.” Sometimes that is true. But a lot of the time, the real problem is much simpler: the diopter is not set correctly. Learning how to set diopter on binoculars is one of those small adjustments …