The Sigma 70-200mm f/2.8 DG DN OS Sports is Sigma's ground-up mirrorless redesign of the classic fast telephoto zoom, built exclusively for Sony E and L-Mount full-frame bodies. Development was announced on 5 October 2023, with full specifications following on 16 November 2023 and shipping starting 7 December 2023. It sits at the top of Sigma's Sports line for mirrorless and is the company's direct answer to the Sony FE 70-200mm f/2.8 GM OSS II and Panasonic Lumix S Pro 70-200mm f/2.8, at a substantially lower price.
Optically it uses 20 elements in 15 groups, including six FLD, two SLD and three aspherical elements, with an 11-blade rounded diaphragm and a 77mm filter thread. Autofocus is driven by dual HLA (High-response Linear Actuator) motors, and the OS2 optical stabiliser algorithm is rated to around 7.5 stops at the wide end. The zoom is fully internal, the barrel is dust- and splash-resistant with an oil- and water-repellent front coating, and it carries a proper Sports-line control set: aperture ring with click and lock switches, three AFL buttons, focus limiter and a removable Arca-Swiss-compatible tripod foot. Weight is 1,335g in Sony E fit (1,345g L-Mount), and the L-Mount version accepts Sigma's 1.4x and 2x teleconverters.
This lens matters because it brought genuine GM-class 70-200mm performance to mirrorless shooters at roughly two-thirds of the first-party price, and for L-Mount users it is the flagship native 70-200mm option. Reviewers consistently rated its sharpness and AF as close to the Sony GM II, with the main trade-offs being extra weight and slightly slower burst compatibility caps on Sony bodies (third-party lenses are limited to 15fps on some Alpha models). On the UK used market it is heavily traded, which keeps supply healthy and makes it one of the best-value fast telephotos you can buy second-hand.
When buying used in the UK, check the zoom and focus rings for smooth, even travel across the range, test the OS for audible knocking or a visibly jumping viewfinder image when half-pressing, and confirm both HLA motors focus silently and without hunting on a mirrorless body. Inspect the front element coating for cleaning marks, make sure the tripod foot, hood and lock switches are present (the dedicated hood and foot are costly to replace), and check for firmware updates via Sigma's USB-capable mount or in-camera update on L-Mount. Confirm the mount fit matches your system, as E and L versions cannot be converted by the user. New UK retail launched around £1,499, so a clean used copy should come in comfortably below that; be wary of examples showing rental-fleet wear such as tripod-collar scoring or worn rubber grips.