Global
| Focal length | 20 mm |
|---|---|
| Maximum aperture | f/1.8 |
| Minimum aperture | f/16 |
| Lens construction | 13 elements in 11 groups (including 2 ED glass elements, 2 aspherical lens elements and Nano Crystal Coat) |
| Angle of view | 90° (74° with Nikon DX format) |
| Minimum focus distance | 0.2 m/0.66 ft from focal plane |
| Maximum reproduction ratio | 0.23x |
| No. of diaphragm blades | 7 (rounded) |
| Filter-attachment size | 77 mm |
| Diameter x length (distance from camera lens mount flange) |
Approximately 82.5 x 80.5 mm/3.2 x 3.2 in. |
| Weight | Approximately 355 g/12.6 oz |
| Supplied accessories | 77 mm snap-on Front Lens Cap LC-77, Rear Lens Cap LF-4, Bayonet Hood HB-72, Flexible Lens Pouch CL-1015 |
| Spatial Frequencies | S: Sagittal | M: Meridional |
|---|---|---|
| 10 lines/mm |  |
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| 30 lines/mm |  |
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