Global
| Focal length | 20 mm |
|---|---|
| Maximum aperture | f/1.8 |
| Minimum aperture | f/16 |
| Lens construction | 14 elements in 11 groups (including 3 ED glass and 3 aspherical lens elements, and elements with Nano Crystal Coat) |
| Angle of view | FX format: 94° DX format: 70° |
| Minimum focus distance | 0.20 m/0.66 ft from focal plane |
| Maximum reproduction ratio | 0.19x |
| Diaphragm blades | 9 (rounded diaphragm opening) |
| Filter-attachment size | 77 mm (P = 0.75 mm) |
| Dimensions | Approximately 84.5 mm/3.4 in. maximum diameter x 108.5 mm/4.3 in. (distance from camera lens mount flange) |
| Weight | Approximately 505 g/1 lb 1.9 oz |
| Supplied accessories | LC-77B Lens Cap (front cap), LF-N1 Lens Cap (rear cap), HB-95 Lens Hood, CL-C1 Lens Case |
| Spatial Frequencies | S: Sagittal | M: Meridional |
|---|---|---|
| 10 lines/mm |  |
 |
| 30 lines/mm |  |
 |
