Sigma professional 70-200mm f/2.8 for Canon EF with OS stabilisation and APO glass.
The Sigma 70-200mm f/2.8 EX DG OS HSM APO is a professional telephoto zoom for Canon EF mount with constant f/2.8 aperture, optical stabilisation, and APO correction. This version adds OS stabilisation to Sigma's acclaimed 70-200mm f/2.8, addressing the main limitation of the earlier non-stabilised variant.
Optical quality is very good with APO glass elements providing excellent colour correction and sharpness across the frame. The constant f/2.8 delivers consistent subject isolation and low-light capability. The OS system provides approximately four stops of stabilisation, essential for handheld telephoto shooting at longer focal lengths.
Build quality follows Sigma's EX premium standard with robust metal construction, HSM autofocus with manual override, and a rotating tripod collar. The lens is well-built for professional use, though heavier than some competing designs. The zoom and focus rings operate smoothly with professional-grade damping.
On the used market, the Sigma 70-200mm f/2.8 OS APO offers stabilised professional telephoto zoom capability at very competitive prices. For Canon shooters wanting constant f/2.8 speed with stabilisation without Canon L-series pricing, it provides excellent professional performance with OS and APO advantages.