Comparison of Canon EF-S 17-55mm f/2.8 IS USM and Tokina 16-50mm f/2.8 AT-X 165 AF PRO DX [S]ave
| Attribute |  Canon EF-S 17-55mm f/2.8 IS USM × |  Tokina 16-50mm f/2.8 AT-X 165 AF PRO DX × |
|---|---|---|
| Filter Size (mm) | 77 | 77 |
| Notes | Image Stabilization; Included Accessories: Lens Hood EW-83J | Available AF Mounts: Canon, Nikon; Included Accessories: Lens Hood |
| Closest Focus (m) | 0.35 | 0.3 |
| Magnification Ratio (x) | 0.17 | 0.2 |
| Type | Standard Zoom | Standard Zoom |
| Length (mm) | 110.6 | 97.4 |
| APS Equivalent | 27 - 88mm | 1.5x: 24 - 75mm; 1.6x: 25.6 - 80mm |
| Zoom System | Rotary | Rotary |
| Image Circle | APS-C | APS-C |
| Focal Length (mm) | 17.00 - 55.00 | 16.00 - 50.00 |
| Brand | Canon | Tokina |
| Name | Canon EF-S 17-55mm f/2.8 IS USM | Tokina 16-50mm f/2.8 AT-X 165 AF PRO DX |
| Weight (g) | 645 | 610 |
| Aperture (f) | 2.80 - 22.00 | 2.80 - 22.00 |
| Diaphragm Blades | 7 | 9 |
| Diagonal Angle of View (degree) | 27.80 - 78.50 | 31.00 - 82.00 |
| Lens Construction | 19 elements in 12 groups | 15 elements in 12 groups, including 1 SD element |
| Diameter (mm) | 83.5 | 84 |
| Focus Details | USM with full-time manual focusing | Internal with One-Touch Focus Clutch mechanism |
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