Four Corner Store has released the US$70 Gizmon iCa Military Edition (http://macte.ch/62K6C). It’s a polycarbonate case system that “transforms your iPhone into an actual rangefinder camera.”
The shutter button on top uses the volume button to trip the shutter. You attach the available wide, macro or fisheye lenses to create effects unavailable in the iPhone by itself.
Constructed of 23 Durable Polycarbonate pieces, the Military iCA wraps itself around your iPhone completely, creating an entirely new Camera. A detachable tripod mount is useful for longer exposures and the soft fabric bag will protect the camera when it’s not in use.