The Sigma 18-50mm f/2.8 DC DN Contemporary is a versatile, ultra-compact standard zoom designed for APS-C mirrorless cameras. Offering a constant f/2.8 aperture throughout its entire focal range, this lens delivers exceptional low-light performance and beautiful bokeh for both stills and video. Weighing just 300g and measuring 74.5mm in length, it's engineered for maximum portability without compromising optical quality. Features include fast and silent autofocus via stepping motor, servo AF support, in-camera aberration correction, and a rubber-sealed mount for reliable performance in varied conditions. With a minimum focusing distance of just 12.1cm, you can capture impressive close-ups and macro-style detail shots. This secondhand example represents an affordable entry point to high-performance Sigma lens quality.