A new patent of the Sigma APS-C zoom 17-55mm f/2.8 OS lens has made an appearance.
| Sigma 17-55mm f/2.8 OS | |
|---|---|
| Patent Filing Date | 03/29/2013 |
| Zoom Ratio | 3.14 |
| Zoom Length | 17.52-30.00-54.94 |
| Fnumber | 2.92 |
| Angle of View | 80.06-50.16-28.52 |
| Image Height Y | 14.20mm |
| Focusing Mechanism | Inner |
Source: Eg