Sigma's Art-line ultra-wide zoom for DSLR — constant f/2.8 from 14-24mm with reference-grade optics.
The Sigma 14-24mm f/2.8 DG HSM Art was released in 2018 as the full-frame ultra-wide zoom for Canon EF and Nikon F bodies. Seventeen elements in 11 groups including FLD, SLD, and aspherical elements. Nine rounded aperture blades. No front filter thread — the bulbous front element precludes standard filters (rear gel holder only). At 1,150g. 26cm MFD at 24mm.
The optical design uses 17 elements in 11 groups (3 FLD + 3 SLD + 3 aspherical including one large-diameter aspherical). Nine rounded aperture blades. No front filter thread — rear gel filter holder. At 1,150g the lens is heavy. Minimum focus distance of 26cm (at 24mm). HSM motor. f/2.8 constant aperture. Full-frame coverage.
The 14-24mm f/2.8 DG HSM is the DSLR-era optical design; distinct from the later DG DN Art (mirrorless-native, different formula, ~795g). The 1,150g weight reflects the large front element required for full-frame 14mm f/2.8 coverage. The absence of a front filter thread means polarisers and NDs require rear gel slot solutions or third-party slip-on adapter systems.
On the used market the Sigma 14-24mm f/2.8 DG HSM Art is affordable as a vintage full-frame ultra-wide. Condition checks: HSM AF response, front element (prominent, no hood protection), rear gel slot condition. No front filter thread. Heavy at 1,150g. Compatible with Canon EF bodies; on RF via EF-RF adapter.