Overview

The Sigma 10-18mm F2.8 DC DN is a compact, lightweight ultra-wide zoom praised for its portability and constant f/2.8 aperture. Optically, it delivers very good center sharpness and good borders, but corners soften at longer focal lengths and wide open. Build quality is solid with a mount gasket, but lacks an aperture ring and weather sealing is limited. Autofocus is adequate for an ultra-wide, though accuracy can vary. It suits APS-C shooters seeking a travel-friendly, fast wide-angle zoom, especially for landscapes and interiors, but not for corner-to-corner sharpness at 40MP.