Af 40mm F2.5, Viltrox Air series lightweight full-frame series introduces a 40mm focal length, efficient and precise autofocus system to capture wonderful moments, so that everyone can enjoy the fun of photography. Covers the full-frame image field and matches more models. Compact and lightweight lens body, easy to carry. The versatile 40mm focal length is ideal for daily shooting and travel.Compact Lightweight Full Frame Auto Focus Lens - Lightweight Full Frame Prime Lens Compact and Lightweight lens body get more inspiration Efficient and Reliable Autofocus Stm stepper motor captures wonderful moments at all times Lightweight and Portable It weigh a less than a mobile phone and is easy to carry when traveling Excellent Video Shooting Outstanding optical performance Eye Af Lack the subject efficiently and acculitelyFull Frame Sensor FormatCovering full-frame mirrorless cameras, it has wider applicability and is enough to adapt to more models of mirrorless cameras.