Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens

Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for Canon SLR Cameras – Product Description:

Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom LensBroaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. In addition, the lens focuses as close as 11 inches (0.28mm), and offers both Canon’s full-time manual focus and a powerful ring-type ultra-sonic monitor (USM) that produces fast and silent autofocus. Other features include a constant f/4 maximum aperture, the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters, and optical coatings optimized for use with digital cameras. Boasting weather-resistant construction similar to other high-end L-series cameras, the lens carries a one-year warranty.


  • Focal length: 17-40mm
  • Maximum aperture: 1:4
  • Lens construction: 12 elements in 9 groups
  • Diagonal angle of view: 104 to 57 degrees (at 30 feet)
  • Focus adjustment: Inner focusing system with USM
  • Closest focusing distance: 0.9 feet
  • Zoom system: Rotating type
  • Filter size: 77mm
  • Dimensions: 3.3 inches in diameter, 3.8 inches long
  • Weight: 1.1 pounds
Product Features :

  • 17-40mm ultra-wide-angle zoom lens with f/4 maximum aperture for Canon SLR cameras
  • 3 aspherical lens elements and super UD glass element create superior optics in all conditions
  • Powerful ring-type ultra-sonic monitor (USM) produces fast and silent autofocusing
  • Focuses as close as 11 inches; supports screw-in 77mm filters or up to 3 gel filters
  • Weather-resistant construction; measures 3.3 inches in diameter; 1-year warranty

Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens – Review:


Figuring out which lens to buy turned out to be more difficult than which camera to purchase! At least for me. I want my lenses to be a reasonable size (rules out the superb 70-200 f2.8 IS L), acceptably fast (at least f 4.0), preferably black (so that they are inconspicuous), not outrageously priced (admittedly this last factor being entirely subjective), and preferably a zoom for the additional flexibility.

Primes are absolutely fantastic values, reasonably priced, fast, and inconspicuous, BUT offer limited flexibility which, in my mind overrides the other factors.

I purchased this lens for the wider end of my shooting needs and I couldn’t be more pleased. It takes beautiful pictures, sharp, beautifully saturated, with no discernable vignetting and little flare under normal circumstances.

This lens has beautiful bokeh IMO and is every bit the equal, again IMO, of the 16-35 f2.8 L in every respect other than speed (f 2.8 vs f 4.0). With the new digital SLR cameras you can easily make up for the loss of speed by cranking up the ISO.

The construction quality is fantastic and it is a lens that you will be able to use forever. It is an ideal lens for the current crop of 1.6 size sensors, but will also serve you well into the future whether you stick with the current size sensor or move up to larger sensors as they become more afordable.

I heartily recommend this lens.



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