Sigma's I-Series 50mm — compact metal-barreled f/2 normal prime for Sony FE and L-Mount.
The Sigma 50mm f/2 DG DN I Contemporary is a compact full-frame mirrorless standard prime from Sigma's I (Inch) series, a premium compact lineup with all-metal construction and switchable aperture click/de-click. Released approximately 2021 for Sony FE full-frame E-mount and L-Mount. DG = full-frame; DN = mirrorless. Sony FE mount.
f/2 maximum aperture. 50mm focal length. 9-blade rounded aperture. Aperture click/de-click switch on lens body. All-metal barrel. Linear stepping motor AF. At approximately 290g. 62mm filter thread. Full-frame coverage. Sony FE mount.
The I Contemporary series prioritises compact build over the resolution-maximised Art line. The aperture click/de-click switch enables smooth video iris pulls without re-clicking the lens for stills shooting. The 50mm f/2 provides a middle option between the compact and the larger, faster f/1.4 Art. De-clicked operation is standard for video use.
On the used market the Sigma 50mm f/2 DG DN I Contemporary is a compact premium standard prime for Sony FE full-frame mirrorless cameras. Condition checks: aperture ring click/de-click switch function, 62mm front element for marks, AF motor response, metal barrel for dents. Full-frame. Sony FE mount.