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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


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