If you are into landscape photography or architecture with the Leica, Fujifilm X-Pro1, Olympus micro 4/3, Panasonic Micro 4/3. or similar cameras that can take the Leica M-mount lenses, here are two very good ideas.
The first is the Voigtlander 21mm Ultron f:1.8lens. It has an integral metal lens hood as part of the mount but also has a filter thread on the front. heavy, solid construction and 1/2 stop detents between the full stop markings on the aperture ring. Apertures down to f:22. We have one for sale new at $ 1195.
The second lens is the multi-focal type from Leica. The 16-18-21 Tri-Elmar is intended to be used without an additional view-finder - eminently suitable for the Leica M or the new Leica T with the appropriate adapter. It is a little more - $ 6365 - But you can console yourself with the thought that the RRP is $ 7000.