| Name |
Sigma 20mm f/1.8 EX DG Aspherical RF |
| Image Circle |
35mm |
| Type |
Wide Prime |
| Focal Length |
20mm |
| APS Equivalent |
1.5x: 30mm; 1.6x: 32mm |
| Max Aperture |
f/1.8 |
| Min Aperture |
f/22 |
| Diaphragm Blades |
9 |
| Lens Construction |
13 elements in 11 groups, including 2 aspherical elements |
| Diagonal Angle of View(Based on image circle) |
94.5 degrees |
| Focus Details |
Internal (Rear Focus) with Dual Focus mechanism |
| Front Element Rotation |
No |
| Zoom System |
n/a |
| Closest Focus |
20cm / 7.9 in. |
| Magnification Ratio |
0.25x / 1:4 |
| Filter Size |
82mm |
| Dimensions(Length x Diameter) |
89.5mm x 88.6mm / 3.5 in. x 3.5 in. |
| Weight |
520g / 18.3 oz |
| Notes |
Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax |
| Typical Online Price |
US$399.00 |
