Leica have announced they are no longer producing this lens 

With its impressive angle of view of 107?, this new TRI-ELMAR conquers 16 mm super wide-angle photography in perfect Leica M style. Due to the minimal distortion and barely perceptible field curvature, it can be recommended for highly demanding architecture photography even at the 16 mm setting. Used on the digital M8, it produces the image effect of a 21 - 28 mm lens, still enabling extreme wide-angle views. The ultra compact shape is achieved by two aspherical elements. A new design of the interior focusing significantly enhances the quality in the close-focus range through an adaption of the floating element principle. Brilliant field depth can therefore be used from a distance of 0.33 m for hyperfocal photography.

This lens is supplied WITHOUT finder.

This compact, fast, short telephoto lens is acclaimed for its excellent image quality at maximum aperture and over the full focusing range from infinity to minimum distance. The speed of this powerful lens allows to single out a sharp detail on a blurred background. Still, the lens offers a natural angle of view that can not be achieved with 90mm telephoto lenses.

This compact lens uses all of today?s technical possibilities to achieve high speed and remarkable imaging quality. It features aspherical surfaces, special glass types with partial anomalous dispersion and floating elements. It is the ideal lens for delivering intimate views of scenes, nature, landscapes and people, whether at infinity or at close-focus range.