Sigma makes the same lens for several mounts, so check the mount in the name first. Then the format: DG lenses cover full frame and DC lenses are designed for APS-C; DN means designed for mirrorless.
The three lines point to different work: Art for maximum image quality and bright apertures, such as the 24-70mm f/2.8 DG DN II or the 20mm F1.4; Contemporary for lighter, more compact lenses, such as the 28-70mm F2.8 or the 16mm F1.4 DC DN; and Sports for action and wildlife, such as the 150-600mm and the 70-200mm f/2.8.
The MC-11 mount converter lets Canon EF lenses be used on Sony E bodies.
