Lightning-Fast Autofocus: The VILTROX AF 40mm f/2.5 FE features a Built-in STM stepping motor for lightning-fast, smooth, and precise autofocus. It also supports face and eye AF for capturing fast-moving subjects in both photos and videos, ensuring you never miss a precious moment. The lens also supports EXIF information transfer and USB upgrades. | 40mm focal length: Close to the perspective of the human eye, can encompass rich environmental elements, but also delicate to highlight the subject, easy to handle humanities street, still life shooting, environmental portraits and other subjects. | Compact and Lightweight Design: Weighing just 167 grams, this compact and stylish lens is perfect for impromptu shoots, whether you're in a bustling city or a tranquil landscape. Its lightweight design makes it ideal for travel and everyday use, and it is compatible with a wide range of mirrorless camera models. | 0.34m closest focusing distance: Closer to the subject, close-up shooting, detail capture, delicate expression.F2.5 large aperture,-7 aperture blades, rounded and dreamy light spots, beautiful bokeh, creating artistic expression. | Advanced Optical Structure: The lens is composed of 10 lenses in 8 groups, including 1 ED lenses, 1aspherical element lenses, and three HR elements contribute lenses. This advanced optical structure ensures that every photo you take is clear, sharp, and distortion-free, delivering extreme sharpness, clarity, and color reproduction.