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.
For Hunters who love the feeling of having the upper hand: the ultra-premium, mid to long range Sig Sauer Zulu9 Binocular utilizes the unique and efficient Abbe-Koenig prism designed to produce ..