Canon EF 17-40mm f/4.0L USM

Announced Feb 27, 2003 •
Wideangle zoom lens | Canon EF
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Product description
Announced Feb 27, 2003
Discuss in the Canon SLR Lens Talk forum

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.

Product timeline
Article, May 3, 2015
Article, Mar 28, 2015
Article, Aug 10, 2014
Article, Feb 27, 2003
Quick specs
Lens type Zoom lens
Focal length 17–40 mm
Image stab. No
Lens mount Canon EF
Max aperture F4.0
Min aperture F22.0
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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