The Tamron 11-20mm f/2.8 Di III-A RXD is a fast-aperture ultra wide-angle zoom lens designed for Sony E-mount APS-C mirrorless cameras. This compact and lightweight lens features a constant f/2.8 maximum aperture throughout the zoom range, making it ideal for landscape, architectural, and astrophotography. With an equivalent focal length of 16.5-30mm on full-frame, the lens delivers exceptional optical performance whilst maintaining portability for everyday use and travel. The advanced optical design includes one XLD element, two glass-molded aspherical elements, and two LD elements to minimise chromatic aberrations and deliver crisp, high-resolution images. A responsive RXD stepping motor provides fast, near-silent autofocus performance for both stills and video, with a minimum focusing distance of just 0.15m at the wide end for creative macro capabilities.