This innovative lens redefines the class of fast standard zooms. born out of a desire to create a handy, easily portable, ultra-wide-angle zoom lens for Sony E-mount mirrorless cameras, the 20-40mm F/2.8 Di III VXD (model A062) is exceptional in many ways. It offers a constant open aperture of F/2.8 over the entire zoom range from 20 mm to 40 mm, it is particularly compact and lightweight, measuring just 86.5 mm in length and weighing 365 g.