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Canon EF 17-40mm F4L USM

Canon EF 17-40mm F4L USM



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The EF 17-40mm f/4L USM is a lightweight ultra wide angle Canon EF zoom lens. It is especially well suited for use with digital EOS SLR cameras with a reduced-size sensor (such as the EOS 7D).

The EF 17-40mm f/4L USM Lens is an ultra-wide-angle lens producing stunning clarity in a range of focal lengths. Its compact, lightweight body makes it an ideal travel companion - suited to interiors, architecture and landscapes, fitting more in the frame without the need to step back. Produce consistent exposures with the large f/4 aperture over the 17-40 mm zoom range and create softer background blur with a 7-blade circular aperture diaphragm. Part of the Canon professional L-series flagship range, its designed for robust handling and resistant to dust and moisture.


  • Capture striking architecture and expansive landscapes with this ultra-wide-angle L-series lens
  • Shoot hand-held and in low light conditions with a fixed aperture of f/4                                            
  • Get closer to your subjects with 0.28 m focusing distance through the entire zoom range                          
  • Ensure accurate colour balance and enhance contrast along with reduced ghosting and flare with Super Spectra coating
  • Produce sharp, high-contrast images with Super UD (ultra-low dispersion) elements to suppress chromatic aberrations
  • Be prepared for split-second moments with a fast, responsive Auto Focus with Ultra-Sonic Motor (USM)                                                         
  • Use specialised filters, such as polarisers and graduates with ease thanks to the non-rotating lens                                                                       
  • Compatible with all DSLR cameras including full frame and EOS M mirrorless with an EF-EOS M Mount adapter

What's in the box

  • EF 17-40mm f/4L USM
  • Lens Hood EW-83E
  • Lens Cap E-77U
  • Lens Dust Cap E
  • Lens Case LP1319
  • User Manual

Angle of view (horzntl, vertl, diagnl)


93° - 49°20', 70°30' - 34°, 104° - 57°30'


Lens construction (elements/groups)




No. of diaphragm blades




Minimum aperture




Closest focusing distance (m)




Maximum magnification (x)


0.24 (at 35mm)


AF actuator




Filter diameter (mm)




Max. diameter x length (mm)


83.5 x 96.8


Weight (g)




Magnification - Extension Tube EF12 II


0.83 - 0.32


Magnification - Extension Tube EF25 II


1.02 - 0.70¹


Lens Cap


E-77U / E-77II


Lens hood




Hard case




Soft case




G.F.Holder III (hood III*)




G.F.Holder IV (hood IV*)




Extenders EF1.4x II and EF2x II


Not compatible


Purchase one of the qualifying EOS Cameras and then purchase one of the qualifying Canon lenses either with the camera or within 90 days to claim up to €1000 cashback from Canon UK & Ireland (In addition to any other Canon offer for which either item qualifiesT&Cs apply). Reward must be claimed via the Online Claim Form. 

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