Comparison of Sigma 20-40mm f/2.8 EX DG Aspherical and Sony FE 16-35mm f/2.8 GM SEL1635GM [S]ave
| Attribute |  Sony FE 16-35mm f/2.8 GM SEL1635GM × |  Sigma 20-40mm f/2.8 EX DG Aspherical × |
|---|---|---|
| Aperture (f) | 2.80 - 22.00 | 2.80 - 22.00 |
| Filter Size (mm) | 82 | 82 |
| Notes | Sony E-mount; Dust and moisture resistant; Includes ALC-SH149 Petal-shaped lens hood. | Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax |
| Closest Focus (m) | 0.28 | 0.27 |
| Magnification Ratio (x) | 0.19 | 0.22 |
| Diameter (mm) | 88.5 | 89 |
| Type | Wide Zoom | Wide Zoom |
| APS Equivalent | 24 - 52.5mm | 1.5x: 30 - 60mm; 1.6x: 32 - 64mm |
| Diaphragm Blades | 11 | 8 |
| Image Circle | 35mm (Full-frame E-Mount) | 35mm |
| Focal Length (mm) | 16.00 - 35.00 | 20.00 - 40.00 |
| Brand | Sony | Sigma |
| Name | Sony FE 16-35mm f/2.8 GM SEL1635GM | Sigma 20-40mm f/2.8 EX DG Aspherical |
| Weight (g) | 680 | 595 |
| Diagonal Angle of View (degree) | 63.00 - 107.00 | 56.80 - 94.50 |
| Lens Construction | 16 elements in 13 groups, including 3 aspherical, 2 XA (extreme aspherical) and 2 ED elements; Nano AR coating; Fluorine coating on the front element | 17 elements in 13 groups, including 2 aspherical elements |
| Zoom System | Rotary | Rotary |
| Length (mm) | 121.6 | 107.8 |
| Diaphragm Blades Type | circular | - |
| Focus Details | Internal; Two DDSSM (Direct Drive Super Sonic wave Motor) actuators with Focus Hold button and AF/MF switch | Internal with Dual Focus mechanism |
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