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| Manufacturer | Canon | Carl Zeiss | Nikon Nikkor | Sigma |
|---|---|---|---|---|
| Model | EF 20 mm f/2.8 USM | Distagon T* 21 mm f/2.8 ZE/ZF/ZK | AF 20 mm f/2.8D | 20 mm f/1.8 EX DG Aspherical RF |
| Lenst style | Wide angle | Wide angle | Wide angle | Wide angle |
| Focal length | 20 mm | 21 mm | 20 mm | 20 mm |
| Maximum aperture | f/2.8 | f/2.8 | f/2.8 | f/1.8 |
| Angle of view | 94.5 o | 91.7 o | 94 o | 94.5 o |
| Closest focusing distance | 0.25 m | 0.22 m | 0.25 m | 0.2 m |
| Maximum magnification | 1:7.14 | 5 | 8.3 | 1:4 |
| Minimum aperture | 22 | 22 | 22 | 22 |
| Diaphragm blades | 5 | 0 | 7 | 9 |
| Auto focus type | USM | MF | AF | AF |
| Lens Construction | 11 elements / 9 group | 16 elements / 13 group | 12 elements / 9 group | 13 elements / 11 group |
| Filter diameter | 72 mm | 82 mm | 62 mm | 82 mm |
| Macro Yes/No | No | No | No | No |
| Stabilization | No | No | No | No |
| Available mounts | Canon EF | Canon EF Nikon F Pentax K |
Nikon F | Canon EF Nikon F Sony A / Minolta Sigma Pentax K |
| Dimensions | 77.5 x 70.6 mm | 108 x 97 mm | 42.5 x 69 mm | 88.5 x 87 mm |
| Weight | 405 g | 600 g | 270 g | 520 g |
| Additional information | Marketed June 1992 | Marketed 1994 | ||
| Score [max 5.00] | ||||
| Our Review |
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