So we know that three generations of the iPhone has still not produced a camera that photographers will be excited about. However, Japanese company Factron may have something to say about that. Two sheets of aircraft grade duralumin are used in the construction of the Factron Quattro iPhone case, and, most importantly, there is a lens mount that allows for interchangeable lenses such as fisheye, wide angle and macro. It's finished off with genuine calf leather on the back. Available through Factron, the case will set you back 19,600 yen or roughly $238. The lenses aren't included, so expect to fork out a bit more them.