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| EF 17-40mm f/4L USM | |
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| Key features | |
|---|---|
| Maker: | Canon |
| Image stabilization: |  No |
| Ultrasonic motor: |  Yes |
| Short back focus: | No |
| Macro capable: | No |
| Application: | Ultra-Wide Zoom |
| Technical data | |
| Type: | Zoom |
| Focal length: | 17-40mm |
| Frame coverage: | Full frame |
| Aperture (max/min): | f/4 - f/22 |
| Construction: | 9 groups / 12 elements |
| # Diaphragm blades: | 7 |
| Close focus distance: | 11in / 280mm |
| Max. magnification: | 0.24 (at 40mm) |
| Physical | |
| Max. diameter: | 3.3in / 83.5mm |
| Max. length: | 3.8in / 96.8mm |
| Weight: | 1.1lbs / 475g |
| Filter diameter: | 77mm |
| Accessories | |
| Lens hood: | EW-83E |
| Case: | LP1319 |
| Angle of view | |
| Horizontal: | 84° – 34° |
| Vertical: | 53° – 19°30' |
| Diagonal: | 74° – 29° |
| History | |
| Introduced: | 2003 |
| Retail info | |
| MSRP US$ | $850 |
The EF 17-40mm f/4L USM lens is a wide-angle lens made by Canon Inc. The lens has an EF mount to work with the EOS line of cameras. Other than the front element, it is sealed against dust and water, and features a diaphragm which remains nearly circular from f/4 to f/8.
Contents |
Audience
The 17-40 is the midrange of Canon's wide angle zoom range, between the superior but more expensive EF 16-35mm f/2.8L USM and the inferior but considerably cheaper EF 20-35mm f/3.5-4.5 USM.
While a member of the L-series, which as a group are primarily aimed at professionals, the 17-40 is itself primarily aimed at advanced amateurs who want a high-quality lens but are unwilling or unable to pay for the 16-35 lens, which costs approximately twice as much as the 17-40.
This lens is also a popular step up from the stock kit lens on many of Canon's EOS Digital family of cameras, the EF-S 18-55mm f/3.5-5.6, for those who wish to remain with a wide angle lens. On a cropped sensor, it has 35 mm equivalent focal length of 27-64mm, which covers wide-angle but not telephoto range. In this role it is compared with the EF-S 17-55.
Companion lenses
This lens is often paired with an L series telephoto lens, such as the EF 28-300mm f/3.5-5.6 L USM or any of the EF 70-200mm family (f/4L USM, f/4L IS USM, f/2.8L USM, f/2.8L IS USM).
Images
 With the provided lens hood. |
 Lens mount with rear gelatin holder. |
 Diagram of the lens, highlighting its different controls and features. |
External links
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Wikipedia content modification information:
- This page was last modified on 14 December 2008, at 03:04.
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