Samsung's 18-200mm f/3.5-6.3 ED OIS Lens (For NX Cameras) might be the one lens to have, if you only have one lens. The incredible 11x wide-angle 27.7-308mm (equivalent in 35mm format) lens can handle just about any photographic subject, from wide, wide landscapes to cityscapes to portraits to group photos to sports to wildlife. And with the built-in lens-shift optical image stabilizer, you'll get crisp, sharp photos and video even using the long telephoto end of the zoom range.
Speaking of video, the 18-200 is optimized for shooting video by using a Voice Coil Motor (VCM) that eliminates noisy autofocus--it also has fast zoom tracking, automatically keeping your subject in focus when zooming in or out. This is an i-Function lens, which allows you to change shutter speed, aperture, ISO and more right on the lens--you never have to take your hands off the lens, or your eyes off the action. The 18-200mm lens is designed for cameras with an NX mount--NX 10/NX100.