Sigma's Art-line 12-24mm f/4 — the widest rectilinear zoom for full-frame with premium optics.
The Sigma 12-24mm f/4 DG HSM Art launched in 2016 as the widest rectilinear zoom in Sigma's Art lineup, covering an extreme 12-24mm on full-frame. At 12mm it provides a 122-degree field of view with minimal distortion — remarkable for such a wide focal length.
Optically excellent — a massive improvement over the older EX DG HSM version with significantly better corner sharpness and distortion control. The constant f/4 aperture is practical for the focal range. HSM motor provides fast, quiet autofocus. Art-line build quality throughout.
Available in Canon EF and Nikon F mounts. Bulbous front element — no standard front filter thread. Rear gel filter holder included. Weighs 1150g — heavy. No weather sealing. Minimum focus distance 24cm. USB dock compatible for AF calibration and firmware.
Available used at mid-range to professional prices. Check for decentering — ultra-wide zooms demand precise calibration. The Sigma 14-24mm f/2.8 Art is faster but less wide. For architecture and real estate where 12mm is essential, this remains the reference choice.