Viltrox 23mm F1.4 Lens features Stm stepping motor, F1.4 aperture for defocusing effects, 11 elements with Hd Nano coating, durable metal body, 0.57lb weight, and micro-usb port for updates.Improved Close-Up Function - Streamlines Close-Up ShotsLens offers great close-up capabilities for easier close-up photos.Flexible Aperture ControlManipulate the aperture ring at the base of the lens to A for automatic adjustment manually adjust the aperture by turning the aperture ring by hand.Classic Humanistic Lens, 11 Elements In 10 Groups11 elements in 10 groups, including 2 Ed lenses and 2 high refractive index lenses, which effectively suppress color difference. The depth of field at the large aperture of F1.4 is minimal, resulting in a significant blur around the focal point.