The Sigma 28mm F1.4 DG HSM Art is a fast, wide-angle lens with a field of view made popular by the current wave of roughly equivalent smartphone camera lenses.
The Sigma 28mm F1.4 DG HSM Art is designed to meet rigorous cinema lens standards and specifically cut down on image distortions like axial aberrations.
The Sigma 56mm F1.4 DC DN Contemporary is smaller sensor cameras like Micro Four Thirds and Sony APS-C E-mount cameras. It works out to a short telephoto portrait lens on those crop sensor bodies.
The Sigma 70-200mm F2.8 DG OS HSM Sports is the latest version of a classic telephoto zoom that's a staple in most pro shooters' bags.
The Sigma 60-600mm F4.5-6.3 DG OS HSM Sports is a 10x zoom lens that can shoot just about anything if you're willing to put up with its relative heft—there are 25 elements inside!