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 | |
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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