Sigma DG DN Lens for Sony Standard Mirrorless 28-70mm F2.8 E-mount, Zoom, Full-frame Cameras, Contemporary.

This lens achieves a high level of balance between two generally contradictory elements: ensuring the high-definition image quality expected of a large-aperture zoom lens, and maintaining a size that is easy to carry around. The material used in appropriate places is "TSC (Thermally Stable Composite)," a polycarbonate with a thermal expansion rate similar to that of aluminum. By narrowing the wide-angle zoom range compared to the 24-70mm F2.8 DG DN | Art, the lens body has been significantly miniaturized. While reducing the number of lens elements, the lens utilizes advanced optical design technology and incorporates numerous special glass materials such as three aspherical lenses, two FLDs, and two SLDs to thoroughly correct axial chromatic aberration and sagittal coma aberration that cannot be corrected by the camera's functions. You can enjoy uniform and sharp image rendering from the center to the edges of the frame. Sony E-mount 28-70mm F2.8 Zoom Standard Mirrorless full-frame