Leica SUMMICRON-M 2 50 mm blackThe Leica Summicron-M 1:2/50 is characterized not only by its compact and proven optical design but also by its natural perspective. Even with the aperture fully open, the optics calculation enables outstanding image quality and excellent contrast throughout the entire image field. Technical details The balanced design makes this ideal standard lens the first choice in every respect - image quality, light intensity, size and weight. Stopping down to f/2.8 or 4 results in only a minimal increase in contrast. The distortion is extremely low and practically invisible.