Sigma has announced the 50-120mm f/2.8 DC OS Contemporary, a fast telephoto zoom for APS-C mirrorless cameras, at $799. Sigma announced it on October 8, and PetaPixel says it completes Sigma's compact trio of zooms for the APS-C format (PetaPixel, Fstoppers).
Price, mounts and timing
The lens costs $799 in the US and £699 in the UK (Camera Jabber). It is made for Fujifilm X, Sony E and Canon RF mounts, and Sigma-authorised dealers start selling it on Thursday, October 22, 2026, according to ProVideo Coalition. US retailers list all three mounts at $799 with the same expected date.
Reach and size
On Fujifilm X and Sony E bodies the 50-120mm range works out to a full-frame equivalent of 75-180mm, and on Canon RF cameras to 80-192mm, because Canon's APS-C crop factor is larger. A constant f/2.8 aperture across the zoom range is what makes the lens notable for the format, since many APS-C telephoto zooms close down as they zoom in.
DPReview gives the dimensions of the E-mount version as 67mm wide and 99mm long, noting that Sigma's published inch figures appear reversed. The length grows by about 25 percent at full zoom. The Sony E version weighs 390g and the Canon RF version 410g, per Camera Jabber, and the lens takes 55mm filters.
Optics and stabilisation
The design has 18 elements in 13 groups, with one FLD element, three SLD elements and four aspherical elements. The aperture uses 11 rounded blades. Sigma rates the optical stabilisation at 6.5 stops at 50mm and 4.5 stops at 120mm, tested to CIPA standards. As with all manufacturer ratings, real results depend on the camera body and the shooter.
Autofocus uses a high-response linear actuator. DPReview reports minimal focus breathing, which matters for video work, and dust and splash resistance.
Controls
The lens has a zoom ring, a focus ring and an aperture ring. Fstoppers says it is the first APS-C zoom in Sigma's Contemporary line with an aperture ring. On the Sony and Fujifilm versions, the ring includes an A position for automatic control. The Canon RF version has a smooth control ring in its place, which reflects how that mount handles lens controls.
| Feature | Sigma 50-120mm f/2.8 DC OS Contemporary |
|---|---|
| Format | APS-C mirrorless |
| Mounts | Fujifilm X, Sony E, Canon RF |
| Equivalent range | 75-180mm (X, E), 80-192mm (RF) |
| Aperture | f/2.8 constant, 11 blades |
| Stabilisation | 6.5 stops at 50mm, 4.5 stops at 120mm (CIPA) |
| Optics | 18 elements in 13 groups |
| Weight | 390g (Sony E), 410g (Canon RF) |
| Filter thread | 55mm |
| Price | $799 (US), £699 (UK) |
| On sale | October 22, 2026 |
Early reviews
PetaPixel's review aggregate scores the lens 91, based on four reviews. Reviewers praised its sharpness and compact build, but noted visible distortion and vignetting and noticeable flare when shooting towards bright light. DPReview called it an APS-C legend in the making for $799, which is the outlet's own enthusiasm rather than a measured result. RedShark News also covered the lens's video credentials.
Sigma also announced a 16-300mm f/3.5-6.7 lens for Nikon Z-mount APS-C on the same day, according to DPReview, which is a separate product. No source confirms a Nikon Z version of the 50-120mm.
What to watch next
Watch for more independent sharpness tests, particularly at 120mm wide open, and for how the lens handles video autofocus on Sony and Fujifilm bodies. Also watch whether rivals respond with their own constant-aperture telephoto zooms for APS-C.
