Olympus USA has announced its M.Zuiko Digital 17mm f1.8 for Micro Four Thirds will be available in December for around $ 500. The lens features the same premium build quality and snap-focus manual focus mode as the company’s 12mm F2.0. The snap-focus mode is engaged by pulling the focus ring on the lens back, which reveals a distance scale and engages end-stops on the focus travel, applies firmer damping and switches the camera to manual focus mode.