Lens details
| Mounts | Canon EF Nikon F Sony / KM A Pentax K Sigma SA |
| Lensname | Sigma 20-40 F/2.8 EX DG ASP |
| Focallength | 20 - 40 mm |
| Speed | F/2.8 |
| Stabilisation | 0 stops |
| Min. focusdistance | 30 cm |
| Size | 89 x 107.8 mm |
| Weight | 595 grams |
| Filtersize | 82 mm |
| Autofocus | Micromotor |
| Aperture blades | 9 blades |
| Minimal aperture | F/22 |
| Elements / groups | 17 / 13 |
| Magnification | 0.22 |
| Hood | LH875_02, supplied |
| F-stop breakdown | N/A |
| Other info |
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