The iPhone is the most popular camera in the world. Yet most photography enthusiasts wish they could push it farther. The Zeiss ExoLens lets you do exactly that. Leveraging the German company's legendary optic expertise, these add-on lenses come in three models — wide-angle, telephoto, and macro — and offer outstanding sharpness and contrast from one edge to the other. The macro lens also holds the distinction of being the first add-on lens to offer a zoom function, and all three lenses attach to a machined aluminum bracket that doubles as a tripod adapter and cold shoe mount for flashes and other accessories.