Overview

The Sigma 28-45mm F1.8 DG DN Art is the world's first full-frame f/1.8 zoom lens, offering prime-like sharpness and a fast aperture for low-light use. Its build is solid, weather-sealed, and includes an aperture ring with click/declick options. However, it is large and heavy at 950g, and some optical compromises exist: noticeable vignetting, moderate lateral CA at 28mm, and imperfect coma correction. It suits journalists, wedding photographers, and those wanting a versatile fast zoom.