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Canon 17-40mm f/4L USM lens review roundup
news posted on December 31, 2006

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Canon 17-40mm f/4L USM reviewThe EF 17-40mm f/4L USM is an ultra wide-angle zoom lens that is being announced simultaneously with the EOS 10D, but is compatible with all Canon cameras that use the company's proprietary EF lens mount. The new lens was developed as a more affordable alternative to the renowned EF 16-35mm f/2.8L USM lens that has become a mainstay for professional photographers around the world. Featuring 3 aspherical surfaces and 1 UD glass element in a 13-element optical formula, the new 17-40mm lens delivers image quality equal to the 16-35mm lens. Like other current L-series models, the new 17-40mm lens is also built to professional standards in terms of build quality, with a metallic lens barrel and extensive gasketing for superb weather resistance.

The Digital Picture reviewed Canon 17-40mm f/4L USM lens and wrote:
"Although the Canon EF 17-40mm f/4.0 L USM Lens can be a good people lens, it is not a good short-distance people lens. A head shot from this lens will emphasize the subject's nose more than the subject will want. The 17-40mm focal length range is great for group pictures, environmental portraits and full body pictures. Stand back and make a person part of a wide landscape shot. If tighter portraits are your interest, look for a lens that gives you at least an 85mm - 135mm equivalent focal length. The captures of your important subject will be more pleasing"
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Sample images

Luminous-landscape reviewed Canon 17-40mm f/4L USM lens and wrote:
"The new 17-40mm f/4L is a welcome surprise though. At nearly half the price of the faster and slightly wider 16-35mm f/2.8L it provides excellent image quality, surpassing that of the more expensive lens in several areas"
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Canon ef 17-40 lens

Photozone reviewed Canon 17-40mm f/4L USM lens and wrote:
"The Canon EF 17-40mm f/4 USM L showed a very good to excellent performance in the lab as well as during the field tests. The lens exhibited very little vignetting and excellent resolution figures. On the downsode the level of distortions could haven been a little better at the wide-angle setting. Typical for most wide-angle zooms chromatic aberrations can be visible but the problem remains comparatively low. The construction quality is next to perfect."
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SLRGear reviewed Canon 17-40mm f/4L USM lens and wrote:
"The Canon 17-40mm f/4 L is a high quality lens with a full-frame image circle that showed really exceptional performance on the EOS-20D we used to test it with. (The EOS-20D has a nominally APS-C size sensor, so corner sharpness and distortion will be better than if the lens is used on a camera with a full-frame sensor.) Sharpness at maximum aperture is excellent across the board (just a slight decrease in sharpness around 30 mm), and the "sweet spot" for sharpness is unusually broad, with truly excellent results from f/5.6 to f/8 at all focal lengths"
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Wlcastleman reviewed Canon 17-40mm f/4L USM lens and wrote:
"If you shoot wide angle, full frame photographs with Canon cameras stopped down at f/8 and beyond, the EF 17-40mm f/4L lens is an outstanding lens. Contrast and sharpness are greatest at the wide end (20 and 24mm) of the zoom range and approach or exceed those of quality prime lenses. Sharpness drops off in far corners at 35mm and 40mm and microcontrast drops off slightly at 35mm. Performance drop at the long end of the zoom range is unlikely to be objectionable in most landscape photos. Linear distortion is present as expected for a 2.5x zoom. Overall, this is a high performance superwide angle zoom for full-frame Canon cameras as befits the "L-lens" designation."
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