The lens’s optical design is 4K-ready, super sharp, high contrast, and exhibits very low distortion and chromatic aberrations. Focus breathing is very well controlled, and the lens has a de-clicked, 9-bladed, curved iris for beautiful bokeh and precise exposure control. The wide T-stop range, from T2.9 to T32, allows for maximum control of exposure and depth-of-field, which is critical when working very close to your subject.