One of the iPhone's biggest strengths has long been its camera, and a new patent application from Apple suggests how it could enhance that even further in the future. The application, first spotted by Patently Apple, is for a dual camera system on the back of a smartphone. Apple's main focus, at least in this patent, is giving photographers a way to zoom in without losing image quality. The idea is that one camera would have a wide lens, and the other would have a much deeper focal length. Then you could switch between the two without losing resolution, as you would using digital zoom.