Due to its large diameter elements, you can shoot with available light even in severe light condition, and also shallow depth of field and the super wide angle, this mix of features offers you a chance to emphasize this main things with great bokeh.
Any kind of aberration is corrected properly by the construction of 13 elements with 11 groups Aspherical element.
13 elements in 11 groups with Aspherical lens.
Full Metal Barrel with high stiffness and durability.
Manual Focus only shoe Smoothly and Perfectly Focusing.
10 aperture blades brings you a beautiful bokeh.
Lenshood included (non-detachable).
Focal Length 21 mm
Aperture Ratio 1: 1.8 Smallest Aperture