The 50-200mm f/4.0-5.6 ED OIS III Lens from Samsung is a telephoto zoom lens for Samsung NX mount cameras with a 35mm format equivalent of 77-308mm. Its fast autofocus motor can lock focus on your subject in as little as 0.17 seconds so you can capture fast moving action and spontaneous moments. A built-in lens-shift image stabilizing system compensates for camera shake to provide sharper photos, even at long telephoto settings and in low-light. The internal focusing system means that the lens length doesn't change when focusing and the front lens element does not rotate. This lens is an i-Function lens, which accesses your camera's manual controls (such as shutter speed, aperture, ISO, etc.) from a ring on the lens --you never have to take your hand off the lens or your eyes off the action to make changes and you can see the effect of your changes before you shoot. And i-Scene mode works with NX cameras to provide ideal scene settings particular to this lens.