SIGMA 50-120mm f/2.8 DC OS Contemporary Announced – 390g APS-C Telephoto Zoom, 6.5-Stop OS, Aperture Ring

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by Johnnie BehiriToday

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SIGMA has announced the 50-120mm f/2.8 DC OS Contemporary, a constant-aperture telephoto zoom for APS-C mirrorless cameras in Sony E, FUJIFILM X, and Canon RF mounts that weighs 390g / 13.8oz and measures 99mm / 3.9in in length. It combines optical stabilization rated at up to 6.5 stops with an HLA linear autofocus motor, an aperture ring, and an optical design that minimizes focus breathing, all for $799.

The new lens is the third and final piece of SIGMA’s constant f/2.8 zoom series for APS-C, joining the 10-18mm f/2.8 DC DN Contemporary and the 18-50mm f/2.8 DC DN Contemporary, which we reviewed on the FUJIFILM X-H2. On Sony and FUJIFILM bodies it covers the equivalent of roughly 75-180mm in full-frame terms. On Canon’s 1.6x crop, that becomes about 80-192mm. According to SIGMA, the three zooms together weigh less than 1kg / 2.2lb, so a 15-180mm equivalent range at f/2.8 now fits into a very small bag.

How it compares to other fast APS-C telephoto zooms

The numbers only make sense next to the alternatives. FUJIFILM’s own XF 50-140mm f/2.8 R LM OIS WR weighs 995g / 35.1oz, is 175.9mm / 6.9in long, and takes 72mm filters. SIGMA’s previous fast telephoto zoom for the format, the DSLR-era 50-100mm f/1.8 DC HSM Art, came in at 1,490g / 52.6oz.

The 50-120mm gives up 20mm at the long end against the FUJIFILM lens and one and a third stops against the old Art zoom. In return, it weighs less than half as much as the first and roughly a quarter as much as the second. Neither Sony nor Canon currently offers a native APS-C telephoto zoom at f/2.8, so shooters on those systems have had to mount full-frame 70-200mm lenses until now.

Optical design and close focus

Inside the barrel are 18 elements in 13 groups, including one FLD element, three SLD elements, and four aspherical elements. SIGMA says this arrangement corrects aberrations from the center of the frame to the edges across the zoom range. The diaphragm uses 11 rounded blades and stops down to f/22.

Minimum focusing distance is 23cm / 9.1in at 50mm and 55cm / 21.7in at 120mm, with a maximum magnification of 1:3 at the wide end and 1:4.7 at the long end. That is close enough for product details and inserts without changing lenses.

The filter thread is 55mm, the same size as on the 18-50mm f/2.8. Anyone already running that lens can move a variable ND or a set of fixed NDs between the two without step-up rings. The 10-18mm uses 67mm filters, so the trio still needs two filter sizes.

What about video use?

SIGMA states that the optical design minimizes focus breathing, and that the HLA (High-response Linear Actuator) motor drives the focus group directly for quiet autofocus.

Stabilization uses the company’s OS2 algorithm and is rated at 6.5 stops at 50mm and 4.5 stops at 120mm, measured to CIPA guidelines. That is two stops less at the long end than at the wide end. Lens-based stabilization matters most on APS-C bodies without IBIS, such as the Sony ZV-E10 II, the FUJIFILM X-M5, or the Canon EOS R50 V.

This is the first APS-C zoom in the Contemporary line with an aperture ring, according to SIGMA. The company does not mention a de-click switch. Its product page also states that the focus mode and OS switches were left off to keep the barrel simple, so AF/MF and stabilization are set from the camera.

One more point for gimbal operators: SIGMA’s product images show the barrel extending as the lens is zoomed toward 120mm. Unlike the internal-zoom SIGMA 17-40mm f/1.8 DC Art, a change of focal length will shift the balance point.

Build, mounts and accessories

The lens has a dust- and splash-resistant structure with sealing at the mount, the focus ring, the zoom ring, and the cover connection. The front element carries a water- and oil-repellent coating. SIGMA is clear that this does not make the lens waterproof.

The Sony E version measures 66.8 x 99.0mm / 2.6 x 3.9in, the FUJIFILM X version 66.8 x 99.3mm / 2.6 x 3.9in, and both weigh 390g / 13.8oz. The Canon RF version is slightly wider and shorter at 69.0 x 97.0mm / 2.7 x 3.8in and weighs 410g / 14.5oz. A lens hood (LH585-01), front and rear caps, and a pouch are included. No tripod collar is listed.

There is no L-Mount or Nikon Z version at launch. SIGMA does offer its Mount Conversion Service for the lens, which lets owners switch between the supported mounts later. Like all SIGMA lenses, the 50-120mm is built at the company’s factory in Aizu, Japan.

Price and availability

The SIGMA 50-120mm f/2.8 DC OS Contemporary costs $799 and will be available from October 22, 2026, for Sony E, FUJIFILM X, and Canon RF mounts at the same time. For more information, please visit the SIGMA website.

What do you think of the SIGMA 50-120mm f/2.8 DC OS Contemporary? Would you choose it over a full-frame 70-200mm on your APS-C camera? Don’t hesitate to let us know in the comments below!