This year marks Leica's 100th birthday as a camera maker and, to celebrate, the venerable German manufacturer has launched an all-new camera system. Perhaps unexpectedly, though, Leica hasn't taken the obvious route and embraced the current fashion for 'retro' design with an interchangeable-lens version of its X Vario APS-C compact. Instead the Leica T is an innovative camera that combines photographer-friendly twin-dial control with a bang-up-to-date touchscreen interface.