On most of standard size binoculars models, there will be a thumb lever or wheel placed conveniently within reach so you can adjust the magnification without changing your grip or taking the eyepieces away from your eyes.
Leupold BX-4 Pro Guide HD 8×42mm Roof Kryptek Typhon Black Binoculars Features:- 100% Waterproof and Fog Proof- BAK 4 Prisms- Ergonomic Design- Fully Multi coated Lens System- High Definition: Lo..