Canon EF 17-40mm lens
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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.
While a member of the L lineup, which is primarily aimed at professionals, the 17-40 is primarily aimed at advanced amateurs who want a high-quality lens but are unwilling or unable to pay for the EF 16-35mm f/2.8L USM lens, which costs approximately twice as much as does 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. This lens is often paired with an L series telephoto lens, such as the EF 28-300mm f/3.5-5.6 USM L or any of the EF 70-200mm family (f/4 USM L, f/2.8 L, f/2.8 USM L, f/2.8 USM L IS).
[edit] Specifications
| Attribute | F/4L |
|---|---|
| Image stabilizer |  No |
| Ultrasonic Motor |  Yes |
| L-series | Yes |
| Diffractive Optics | No |
| Macro | No |
| Maximum aperture | f/4 |
| Minimum aperture | f/22 |
| Weight | 475g |
| Diameter | 83.5 mm |
| Length | 96.8 mm |
| Filter diameter | 77 mm |
| Horizontal viewing angle | 93° – 49° (36mm) |
| Vertical viewing angle | 70.18° – 33.80° |
| Diagonal viewing angle | 104° – 57° (43.2mm) |
| Groups/elements | 9/12 |
| # of diaphragm blades | 7 (circular aperture) |
| Closest focusing distance | 0.28 m |
| MSRP $ | $850 |
[edit] See also
[edit] External links
- At Canon's website:
- At dpreview.com:
- At fredmiranda.com:
- At photozone.de:
