Sigma's extreme APS-C ultra-wide zoom — 12-24mm equiv at variable aperture with rectilinear correction.
The Sigma 8-16mm f/4.5-5.6 DC HSM is one of the widest rectilinear zooms for APS-C DSLRs, covering 12-24mm equivalent. At 12mm equivalent the field of view exceeds 120 degrees with controlled distortion — remarkable for a non-fisheye lens.
Optically impressive for the extreme focal lengths — good centre sharpness with managed distortion. The variable f/4.5-5.6 aperture is slow but expected for this extreme range. HSM motor for fast, quiet AF. DC designation means APS-C only.
Multiple DSLR mounts. Bulbous front element — no standard filter thread. Rear gel holder. Approximately 555g. No weather sealing. Minimum focus distance 24cm. The built-in petal hood provides some protection for the protruding front element.
Available used at budget to mid-range prices. The 12mm equivalent (8mm on APS-C) is extremely wide — creates dramatic perspectives. The bulbous front prevents filters. Check for decentering — extreme wide-angles are sensitive. Unique for APS-C ultra-wide enthusiasts.