The intrinsic value of a fine binocular lies in its ability to produce bright, sharp, aberration-free images. But you can only get the most out of your optic if you know how to adjust a binocular.

Celestron's SkyMaster Pro ED 20x80mm Porro binoculars feature ED glass, larger prisms, and a 20x magnification with 80mm objective lenses. The binoculars include a tripod adapter, neck strap, diopter ...

Sporting a roof-prism design to cut size and weight, the 23-ounce Hawthornes are sleek under a jacket. And while we liked the idea of having the built-in diopter adjuster on the center focus ...