The Sigma AF 18-50mm F2.8 DC DN Contemporary is a compact, lightweight standard zoom lens designed for Sony E-mount APS-C mirrorless cameras. Featuring a constant f/2.8 aperture throughout the entire focal range and a 27-75mm full-frame equivalent coverage, this versatile lens excels across landscapes, portraits, street photography, architecture, and event work. The stepping motor autofocus system delivers fast, quiet operation ideal for both stills and video, whilst the minimum 12.1cm focusing distance enables macro-style close-up work. Weighing just 290g and measuring only 74.5mm in length, this is one of the most portable constant-aperture standard zooms available for crop-sensor mirrorless systems. The optical design incorporates three aspherical elements and one Special Low-Dispersion element, coupled with Super Multi-Layer coating to minimise flare and ghosting.