| Attribute | Value |
|---|---|
| Lens Construction | 17 elements in 13 groups, including 2 aspherical elements |
| Diameter | 89 mm |
| Zoom System | Rotary |
| Diagonal Angle of View | 56.80 - 94.50 degree |
| Aperture | 2.80 - 22.00 f |
| Notes | Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax |
| Filter Size | 82 mm |
| Magnification Ratio | 0.22 x |
| Closest Focus | 0.27 m |
| Focus Details | Internal with Dual Focus mechanism |
| Length | 107.8 mm |
| Diaphragm Blades | 8 |
| APS Equivalent | 1.5x: 30 - 60mm; 1.6x: 32 - 64mm |
| Focal Length | 20.00 - 40.00 mm |
| Image Circle | 35mm |
| Brand | Sigma |
| Name | Sigma 20-40mm f/2.8 EX DG Aspherical |
| Weight | 595 g |
| Type | Wide Zoom |
| 35mm Equivalent | Add |
| Effective Reduction in Aperture | Add |
| Focal Length Multiplier | Add |
| APS-C Equivalent | Add |
| Diaphragm Blades Type | Add |
| Front Element Rotation | Add |