| Focal length | 20mm |
|---|---|
| Aperture Range | f/4 – 22 |
| Coverage of image circle | 65mm |
| Angle of view | 94.4° |
| Lens structure | 16 elements in 11 groups |
| Lens structure | 16 elements in 11 groups (2 aspherical elements and 3 ED elements) |
| Filter size | 82mm |
| Aperture blades | 14 blades |
| Maximum magnification | 0.17x |
| Min. Focusing Distance | 25cm |
| In-focus driving mode | Manual (MF) |
| Dimensions | 95mm x 91mm |
| Weight | 747g |
| Mount | Pentax K |