Canon EF 17-40mm F/4L USM



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.

SKU: 000873 Categories: ,
Principal specifications
Lens type Zoom lens
Max Format size 35mm FF
Focal length 17–40 mm
Image stabilization No
Lens mount Canon EF
Maximum aperture F4
Minimum aperture F22
Aperture ring No
Number of diaphragm blades 7
Elements 12
Groups 9
Special elements / coatings Super Spectra coatings
Minimum focus 0.28 m (11.02)
Maximum magnification 0.24×
Autofocus Yes
Motor type Ultrasonic
Full time manual Yes
Focus method Internal
Distance scale Yes
DoF scale Yes
Weight 500 g (1.10 lb)
Diameter 84 mm (3.29)
Length 97 mm (3.81)
Materials Metal barrel, metal mount
Sealing Yes
Colour Black
Zoom method Rotary (internal)
Power zoom No
Zoom lock No
Filter thread 77 mm
Hood product code EW-83E
Tripod collar No
Optional accessories Soft Case LP1319

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