Leica Summilux-M 75mm f/2.5 is an intriguing, ultra compact short telephoto lens. The lens is designed to offer optimum optical and mechancial excellence. The lens enables you to shoot wide-open at f/2.5, thus creating a creamy bokeh and shoot under low light. The lens features 6 elements in 4 groups, 11 aperture blades, 2.9 feet close focusing distance and E46 filter thread. In addition, this lens has been updated with the 6-bit coding, thus allowing the digital M camera to read and store its information optically and to identify which lens is being utilized.