Leica 24mm F2.8 Elmarit Asph. So the 35mm Summicron is not wide enough and you want to add a lens with a wider perspective to your kit.  There are three wide angle choices in the Leica M system with 21mm, 24mm and 28mm focal lengths.  The 24mm is a good focal length for photojournalists allowing a great depth of field and a wide perspective.  It can also be used for City & Street scenes.  For landscapes, the lens can be used to emphasize a foregroud object without losing track of where you are.  The 24mm can be a very useful lens if learned how to use properly.  It is one of the newer Leica lenses to the line up and therefore must be used with the auxilliary finder as there are no framelines available in any current Leica rangefinder camera.   24mm F2.8 Elmarit Asph. 1996-Present SN#N/A Finish Black Mount Rigid Lens Elements 7 in 5 Groups with 1 Asph. Filter Size 55mm Apertures F2.8-F22 Angle of View 84 Degrees Minimum Focus Distance 70cm Units Produced N/A Weight 290 Grams