This lens is the Sigma 16mm f/1.4 DC DN Contemporary.
It is a highly popular, ultra-bright wide-angle prime lens designed specifically for crop-sensor (APS-C and Micro Four Thirds) mirrorless cameras.
Key Details from the Images:
16mm 1:1.4: Denotes a 16mm focal length with a very bright maximum aperture of f/1.4 (excellent for low-light photography and creating a shallow depth of field).
DC: Sigma's designation for lenses engineered for crop sensors (APS-C).
DN: Indicates it is built exclusively for mirrorless camera systems.
\phi67: It takes a 67mm front filter size.
The Silver "C" Badge: Visible on the side of the barrel, confirming it belongs to Sigma's Contemporary lineup.
0.25m/0.82FEET-\infty: The minimum focusing distance is 25 cm (about 9.8 inches).
Lens Mount Note:
While the physical lens markings are identical across variants, this lens is manufactured in several mirrorless mounts (including Sony E-mount, Fujifilm X-mount, Canon EF-M, Micro Four Thirds, Nikon Z-mount, and L-mount).
The base of the lens tapers down cleanly toward the mount area, which is highly characteristic of the Sony E-mount or Fujifilm X-mount versions of this specific lens.