Sigma 50-120mm F2.8 DC OS: Telephoto Zoom for APS-C

Key specs

On APS-C the zoom covers roughly 75 to 180 mm in 35mm terms. The optical design has 18 elements in 13 groups, including one FLD element, three SLD elements and four aspherical elements; the aperture has eleven rounded blades. Minimum focusing distance is 23 cm (wide) to 55 cm (tele), and maximum magnification is 1:3 to 1:4.7. The filter thread measures 55 mm. The Sony E version is 99.0 mm long and weighs 390 g, the Fujifilm X version 99.3 mm and 390 g, and the Canon RF version 97.0 mm and 410 g Sigma product page.

Autofocus, stabilization and build

Autofocus is driven by the HLA (High-response Linear Actuator) linear motor. The image stabilizer with the OS2 algorithm delivers 6.5 stops at the wide end and 4.5 stops at the tele end by CIPA measurement. According to Sigma the construction is dust- and splash-resistant but not waterproof, and the front element has a water- and oil-repellent coating. The optical design is meant to minimize focus breathing. There are no switches for focus mode or stabilization Sigma product page. It does have an aperture ring, which Sigma calls a first among its Contemporary APS-C zooms Sigma USA.

Context and what is in the box

According to Sigma, the 50-120mm completes its series of fast Contemporary zooms for APS-C: it now consists of the 10-18mm F2.8 DC DN, the 18-50mm F2.8 DC DN and the new model, which together weigh less than one kilogram. The box includes the LH585-01 lens hood, front and rear caps and a pouch Sigma product page.

Browse all lenses for Sony E, Fujifilm X and Canon RF in the lens finder.