how2fly (@camerainsider) posted a spec list and three photos for a Sigma 50-120mm F2.8 DC OS | Contemporary. Sigma has not announced the lens. DC is Sigma’s APS-C line, and the lineup shot puts the new barrel next to the existing 10-18mm F2.8 DC DN and 18-50mm F2.8 DC DN.
The only weight in the post is 390 g for Sony E. No other mount, no price, and no ship date are in that post.
What the post lists
| 50-120mm F2.8 DC OS | Contemporary | |
|---|---|
| Coverage | DC (APS-C), constant F2.8 |
| Optics | 18 elements / 13 groups |
| Closest focus | 23 cm wide / 55 cm tele |
| Magnification | 1:3 wide / 1:4.7 tele |
| OS | 6.5 stops wide / 4.5 stops tele |
| AF / filter / weight | HLA · 55 mm · 390 g (Sony E) |
On APS-C that range is roughly a 75-180mm equivalent, so it reads as the tele companion to the 18-50mm F2.8, sharing the same 55 mm filters. The post does not say whether the HLA motor or the OS figures are CIPA-rated, or which body they were measured on.
The optical drawing is unlabeled. Do not read the colored elements as a confirmed aspherical or SLD count. The only construction figure in the text is 18/13.
Via how2fly on X.