Comparison of Canon EF 17-40mm f/4L USM and Olympus 12-40mm ƒ/2.8 Pro M.Zuiko Digital ED [S]ave
| Attribute |  Canon EF 17-40mm f/4L USM × |  Olympus 12-40mm ƒ/2.8 Pro M.Zuiko Digital ED × |
|---|---|---|
| Filter Size (mm) | 77 | 62 |
| Notes | Dust and moisture resistant | Dust and Splash-proof |
| Closest Focus (m) | 0.28 | 0.2 |
| Magnification Ratio (x) | 0.24 | 0.3 |
| Diaphragm Blades Type | - | circular |
| Type | Wide Zoom | Standard Zoom |
| APS Equivalent | 27 - 64mm | - |
| Zoom System | Rotary | Rotary |
| Image Circle | 35mm | Image Circle |
| Focal Length (mm) | 17.00 - 40.00 | 12.00 - 40.00 |
| Brand | Canon | Olympus |
| Name | Canon EF 17-40mm f/4L USM | Olympus 12-40mm ƒ/2.8 Pro M.Zuiko Digital ED |
| Weight (g) | 500 | 382 |
| Aperture (f) | 4.00 - 22.00 | 2.80 - 22.00 |
| Diaphragm Blades | 7 | 7 |
| Diagonal Angle of View (degree) | 57.50 - 104.00 | 30.00 - 84.00 |
| Lens Construction | 12 elements in 9 groups, including 3 aspherical elements and 1 S-UD element | 14 elements in 9 groups, including 1 aspherical ED element, 2 aspherical elements, 1 DSA element, 2 ED element, 1 HD element, and 2 HR elements |
| Diameter (mm) | 83.5 | 70 |
| Length (mm) | 96.8 | 84 |
| 35mm Equivalent | - | 24 - 80mm |
| Focus Details | Inner focusing; full-time manual focus and USM; | - |
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