Leica Summicron-M 35mm f/2 ASPH

Manufacturer description: The versatile all-around lens delivers phenomenal overall image quality, high contrast and exemplary resolution over its entire aperture range, even wide open. By closing the aperture down only 2 stops to f/4, it delivers maximum resolution and contrast that is unsurpassed. It also impresses by being virtually distortion-free. The word "standard" is particularly fitting for this astoundingly compact wide-angle jewel. It turns any Leica M camera into a highly compact and elegant unit, allowing the photographer to shoot discreetly, without drawing attention.