Comparison of Canon EF 20mm f/2.8 USM and Tokina 17mm f/3.5 AT-X 17 AF PRO Aspherical [S]ave
| Attribute |  Tokina 17mm f/3.5 AT-X 17 AF PRO Aspherical × |  Canon EF 20mm f/2.8 USM × |
|---|---|---|
| Diagonal Angle of View (degree) | 103.70 | 94.00 |
| Filter Size (mm) | 77 | 72 |
| Aperture (f) | 3.50 - 22.00 | 2.80 - 22.00 |
| Closest Focus (m) | 0.25 | 0.25 |
| Magnification Ratio (x) | 0.11 | 0.14 |
| Type | Wide Prime | Wide Prime |
| Focus Details | Internal with Focus Clutch mechanism | Inner focusing; full-time manual focus and USM |
| APS Equivalent | 1.5x: 25.5mm; 1.6x: 27.2mm | 32mm |
| Diaphragm Blades | 7 | 6 |
| Image Circle | 35mm | 35mm |
| Focal Length (mm) | 17.00 | 20.00 |
| Brand | Tokina | Canon |
| Name | Tokina 17mm f/3.5 AT-X 17 AF PRO Aspherical | Canon EF 20mm f/2.8 USM |
| Weight (g) | 435 | 405 |
| Diameter (mm) | 84 | 71 |
| Length (mm) | 57 | 77 |
| Notes | Available AF Mounts: Canon, Minolta, Nikon; Included Accessories: Flower type lens hood | - |
| Lens Construction | 11 elements in 9 groups, including 1 aspherical element | 11 elements in 9 groups |
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