Canon EF 17-40mm f/4.0L USM

Announced Feb 27, 2003 •
Wideangle zoom lens | Canon EF | 8806A002
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Product description
Announced Feb 27, 2003
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The Canon EF 17-40mm F4.0L USM has been on the market for many years now, but remains popular with Canon photographers using both full-frame and APS-C DSLRs (on which it covers an equivalent focal length range of 27-64mm). An extremely tough and compact lens, the 17-40mm does not get any larger when zooming or focusing, and the inclusion of three aspherical and one Super UD (Ultra-low Dispersion) elements result very good image quality across its focal range. This lens is weather-sealed, and a ring-type ultrasonic focus motor provides fast and silent AF with full-time manual focusing.

Quick specs
Lens type Zoom lens
Focal length 17–40 mm
Image stab. No
Lens mount Canon EF
Max aperture F4
Min aperture F22
Min focus 0.28 m (11.02)
Max magnification 0.24×
Weight 500 g (1.10 lb)
Length 97 mm (3.81)

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