Auto Focus: The lens has high image quality, high mobility, and excellent autofocus performance, which can help professional video and VLOG creators to complete high-quality video work. Support Eye Focus, the subject can be accurately tracked by detecting the movement of the eyes. | Large Aperture: Bright f/1.4 maximum aperture suits working in low-light conditions and also affords greater control over the depth of field. Integrated manual aperture ring for tactile exposure control; this ring also features an 'A' position for automated, camera-based aperture selection. | STM Quiet Motor: The SMT stepping motor enables quick, quiet, and precise autofocus performance along with a full-time manual focus override. Additionally, an internal focusing design maintains the overall lens length during use for improved handling and quicker response. | HD Nano: The lens adopts HD Nano Multilayer Coating & STM Step Motor, 11 elements in 10 groups, 9 aperture blades, including 2 ED lenses and 2 high refraction index lenses. Built-in USB port for the firmware to reach compatibility with the newest camera model and supports EXIF information transmission. | Personalized Design: The body of the lens is a refined metal structure that is very textured, the whole lens weight is only 300g. Lightweight and compact lens design and versatility can meet the different needs of photographers and video users, easy to carry and operate.