Voightlander 21mm f1.8 Ultron - M Mount

With this lenes its large diameter elements, you can shoot with available light even in severe lighting conditions, and also acheive a shallow depth of field and super wide angles, this mix of features offers you a chance to emphasize main things with great bokeh. Any kind of aberration is corrected properly by the construction of 13 elements 11 groups with an aspherical element.