F1.2 aperture greatly benefits shooting in low-light situations; STM motor design brings accurate, quick and quiet autofocus shooting experience; ED glass and high refractive index glass are added; 75mm lens helps separate the subject from the background, making it easy to focus on the subject; Distortion and optical aberration are well controlled; Supporting cameras Eye AF feature helps focus on human eyes easily even if the subject moves fast; When videoing, the subject is always detected and tracked, thus helping create a smooth and high-end production