We’ve seen a lot of photo add-ons for the iPhone, some useful, some downright bizarre. Luckily, the iPhone Lens Dial ($250) falls into the latter group. This photo-enhancing tool is actually an aircraft-grade aluminum case for the iPhone 4 and iPhone 4S that boasts dual tripod mounts — one for portrait and one for landscape — and a “wheel attachment on the back that spins to put a high-quality glass fisheye, wide angle, or telephoto lens atop your iPhone’s existing optic, extending your photographic options well beyond the limits of your favorite app