Perfect for portraiture, the Sigma f/2.8 DG Contemporary Lens is an especially compact mid-telephoto prime offering a selective field of view and modest maximum aperture that's an ideal combination for headshots, group shots, close-up shots, and compressed landscapes while remaining nimble enough for everyday shooting.
The 90mm focal length is a classic narrow field of view that flatters portrait subjects and the f/2.8 maximum aperture is bright enough for depth of field control and working in available lighting without adding unwanted weight and size to the lens design.
Alternatively, the compact is also a beneficial lens for landscape shooters looking to make more condensed and focused compositions and highlight specific subjects from a distance.