Sigma's Art-line 24-105mm f/4 — sharp standard zoom with OS and HSM for Canon and Nikon DSLRs.
The Sigma 24-105mm f/4 DG OS HSM Art launched in 2013 as Sigma's first Art-line zoom, directly competing with the Canon EF 24-105mm f/4L IS and Nikon 24-120mm f/4G VR. It offered Art-line optical quality at a lower price than the first-party alternatives.
Optically very good — sharper than the Canon 24-105mm f/4L Mark I across most of the frame, with well-controlled distortion and chromatic aberration. OS (Optical Stabilisation) provides approximately 4 stops of correction. HSM motor is fast and quiet.
Available in Canon EF and Nikon F mounts. 82mm filter thread. Weighs 885g — heavier than the first-party equivalents. No weather sealing. Minimum focus distance 45cm. USB dock compatible for AF fine-tuning and firmware updates.
Available used at reasonable prices. The 82mm filter thread and 885g weight are the main drawbacks. Check for front and back focus — use the USB dock for calibration. A strong alternative to the Canon 24-105mm f/4L Mark I but the Mark II Canon closed the gap.