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Features and Specifications
(Image from Canon Website)
The Canon EF 17-40mm f/4L USM lens is known for its sharp output and excellent image quality. Listed below are the features and specifications.
* A zoom lens with focal length range of 17mm to 40mm.
* USM Motor for auto focus
* Minimum focusing distance of 0.28m
* Speed - f/4.5
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The Canon EF 17-40mm f/4L USM provides a sharp output and excellent image quality. It's large size and adequate weight provides stability when shooting handheld. However, lens flare can be a problem at times, and the lens hood supplied is not very efficient in reducing stray light. There is no significant visible distortion even at wide angle. Below is a sample image shot using the lens, and a 100% crop to demonstrate the image quality.
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Being a light weight, wide angle lens, the 17-40mm is not equipped with IS (image stabilization). At f/4, it is also not a fast lens and is hard to use without a tripod in low light. With the USM Motor, autofocus is silent and instantaneous. A very close minimum focusing distance of 0.28m permits shooting objects from very close.
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Value for MoneyRating
Canon's suggested retail price for the lens is $819.99. For this price, the EF 17-40mm f/4L USM is good value for your money. It costs only a half of its nearest counterpart (16-35mm f/2.8L) and yet delivers high quality images. The sharpness of the images taken using the lens are on par with more expensive lenses.
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The Canon EF 17-40mm f/4L USM lens is very handy for landscape and other form of wide angle photography. On a digital body with 1.6x crop factor, it has an effective focal length of 27.2mm at the wide end. Hence, though much more expensive, the 17-40mm lens can serve as an option against 28-80mm kit lens for those who need a wide angle alternative. At f/4, it is not a fast lens and requires constant use of tripod for use in serious landscape photography.
For more information on this camera lens, please visit the Canon's product webpage.