Sigma's second-gen 12-24mm ultra-wide zoom — 12mm rectilinear coverage with improved coatings over the original.
The Sigma 12-24mm f/4.5-5.6 DG HSM II is the second generation of Sigma's 12mm ultra-wide rectilinear zoom — one of the widest non-fisheye zooms ever made. The Mark II improved coatings and reduced flare compared to the original 2003 version.
Good centre sharpness. Soft corners at 12mm wide open — stopping down to f/8 improves edges. HSM motor provides fast AF. The slow f/4.5-5.6 variable aperture limits low-light and astrophotography use compared to the f/4 Art successor.
Canon EF mount, full-frame. Bulbous front element — no front filter thread. Rear gel filter holder. No weather sealing. 670g weight. Also available in Nikon F mount.
Available cheaply used. The Sigma 12-24mm f/4 Art is the dramatically superior successor. Check for decentring at the corners. The bulbous front is vulnerable to damage — inspect carefully.