Enter the Gladiator. BarskaA(R)'s 10-30x50mm Reverse Porro Gladiator Zoom Binoculars combine big extended magnification in a compact package. The reverse porro prism design creates a more compact overall size compared to traditional porro prism binoculars, while still retaining full-size features like the large 50mm objective lenses. A zoom level lets you quickly and easily transition through the magnification ranges from 10x all the way up to a dialed-in 30x. 10-30x magnification 50mm objective lens Reverse porro prism design Fully coated optics increase light transmission for a bright, crisp image BK-7 prisms Right-eye diopter Fold-down rubber eyecups Shock-absorbing rubber armor for grip and durability Large center focus knob Includes lens covers, neck strap and carry case