Offering the brightness of constant F2.8 and outstanding portability, the 11-20mm F/2.8 Di III-A RXD (Model B060) is a fast-aperture ultra wide-angle zoom lens for Sony E and FUJIFILM X-mount APS-C mirrorless cameras. Since the fast F2.8 aperture lets you maintain a high shutter speed even when shooting in dark conditions, you can capture sharp images handheld with minimal shake. Also, special lens elements have been optimally arranged to suppress optical aberrations. These features combine to produce clear images and high-resolution performance throughout the zoom range. The lens is so lightweight and compact that it is hard to believe it is a fast-aperture ultra wide-angle zoom lens. This makes it ideal for everyday use, and for travel when you want to carry a smaller camera bag.