Voigtländer

21mm F/1.8 Ultron Aspherical for Leica M

Wide angle prime lens

The Voigtlander 21mm f/1.8 is a great all round lens. Thanks to its fast f/1.8 aperture, you can shoot with available light even in severe lighting conditions. In addition to letting in plenty of light, the wide aperture creates a shallow depth of field and beautiful background blur.  Any kind of chromatic aberration is corrected properly by the construction of 13 elements 11 groups with an aspherical element.