Ultra-wide-angle lens for serious applications. Easy to hold and carry at 14.3 oz. (405g). Floating rear focusing system. Sharp images are obtained at all subject distances.
| Focal Length & Maximum Aperture | 20mm 1:2.8 |
| Lens Construction | 11 elements in 9 groups |
| Diagonal Angle of View | 94 |
| Focus Adjustment | Rear focusing system with USM |
| Closest Focusing Distance | 0.25m / 0.8 ft. |
| Filter Size | 72mm |
| Max. Diameter x Length, Weight | 3.1" x 2.8", 14.3 oz. / 77.5 x 70.6mm, 405g |