Auto focus: AF 56/1.4 lens supports eye auto focus, easy to identify the subject; auto focus is fast and accurate, allowing you to capture the focus in time during the shooting process, get professional and clear photos | F1.4 large aperture: adopts 9 aperture blades, F1.4 large aperture design, dual aperture adjustment, automatic camera adjustment or manual adjustment at the bottom of the lens, which can increase the amount of light in dark environments, in portraits, flowers, and still life in shooting scenes In, you can use a large aperture to shoot the effect of real and virtual, so that the subject is more clear and prominent, and the artistic appeal is enhanced | STM stepping motor design: The lens adopts a gear-type STM stepping motor, which has low noise and can provide a quiet autofocus experience, which can improve focusing efficiency and achieve accurate and smooth autofocus | USB firmware upgrade: There is a USB upgrade interface at the bottom of the lens, which can upgrade the firmware of the lens; and supports EXIF information transmission, which can view photo information in real time | 9 groups and 10 elements optical structure: including 1 ED lens and a high refractive lens, adopts high-definition nano multilayer coating,sturdy and durable all-metal lens body structure to ensure the assembly accuracy and durability of the lens