Sigma's compact I-Series 35mm f/2 for mirrorless — premium build with metal barrel and de-click aperture.
The Sigma 35mm f/2 DG DN Contemporary (I Series) was released approximately 2021 as a compact fast wide prime for Sony FE-mount full-frame. Nine elements in 8 groups. Nine aperture blades. 55mm filter thread. At 325g. 0.19m MFD. Stepping motor AF. Metal barrel construction.
Nine elements in 8 groups. Nine aperture blades. The 55mm filter thread. At 325g. Minimum focus distance of 0.19m. Stepping motor for quiet AF. Metal exterior barrel (I Series premium build). f/2 maximum aperture. Full-frame coverage (DG DN). Sony FE mount.
The I Series designation is Sigma's premium compact line within the Contemporary tier: the I Series uses metal barrels, de-clicked aperture rings, and compact designs optimised for mirrorless-native form factors. The 0.19m MFD provides close-focus capability well beyond the 0.30-0.35m typical of 35mm primes. At 325g it is notably compact for full-frame f/2.
On the used market the Sigma 35mm f/2 DG DN I Series Contemporary Sony FE is affordable as a compact fast wide prime. Condition checks: AF response, 55mm front element for marks, de-click aperture ring function. Full-frame Sony FE. Compatible with all Sony FE-mount full-frame and APS-C E-mount bodies.