4 2 5 0

The Canon EF-S 17-40mm f/4L USM is an ultra wide-angle zoom lens built for both film and digital SLRs.

Where to buy

Seller Price Seller Rating
Show more

full frame

1 agrees

solid optical performance all around - much improved light falloff and sharpness stopped down to F/5.6

1 agrees

moderately priced - a great upgrade from a kit lens on a crop sensor camera

1 agrees

lightweight - the lightest L series lens to date

1 agrees

fully weather sealed body (requires a filter)

1 agrees

L series - Canon's highest quality glass, professional build and optics

1 agrees

includes a lens hood for improved contrast, flare resistence and physical protection as well as a carrying case for safe transportation when not in use

1 agrees

USM - fast, silent and accurate autofocus

1 agrees
  • Only 3 words are allowed.

no image stabilization

1 agrees

weaker fixed aperture of F/4, not as good as the professional F/2.8 standard that allows for better performance in low light, better DOF seperation

1 agrees
  • Only 3 words are allowed.


The Canon EF-S 17-40mm f/4L USM is an ultra wide-angle zoom lens built for both film and digital SLRs. This is built to be a more affordable alternative to higher grade lenses like the Canon EF-S 16-35mm f/2.8L II USM. Three Aspherical lens elements and a Super Ultra-low Dispersion glass element combine to provide high quality images, and a optical coatings have been applied to aid when the lens is used with digital cameras. The lens can focus as close as 11 inches, and uses a fast and silent autofocus in addition to a ring-type manual focus. Filters can be screwed into the 77mm fitting, or up to three gel filters can be placed in a holder in the rear. The construction is weather-resistant to allow the lens to be used in a maximum number of settings.

  • Ultra wide-angle zoom lens
  • Weather-resistant
  • Works with film and digital SLRs
  • Optical coatings optimized for digital cameras
  • Constant f/4 maximum aperture
  • Focal Length: 17 - 40mm
  • Maximum Aperture: 1:4
  • Lens Construction: 12 elements in 9 groups
  • Focus Adjustment: Inner focusing system with USM
  • Closest Focusing Distance: 0.28m / 0.9 ft (11 in)
  • Zoom System: Rotating type
  • Filter Size: 77mm
About Us