no consumer

Canon EF 17-40mm f/4L USM

EF 17-40mm f/4L USM

The EF 17-40mm f/4L USM is an ultra wide-angle zoom lens that offers excellent image quality and a constant maximum aperture. Its compact, lightweight body makes it an ideal travelling companion.

Benefits

  • Superb optical performance throughout the zoom range
  • Fast autofocus speed
  • Highly resistant to dust and moisture
  • 28cm minimum focusing distance at all focal lengths

Detailed Features

Take a more detailed look into the Canon EF 17-40mm f/4L USM

Ultra-wide or standard zoom


The EF 17-40mm f/4L USM acts as an ultra-wide angle zoom on film or full-frame digital EOS cameras. On DSLRs equipped with APS-C sized sensors it acts as a standard zoom, giving an angle of view equivalent to a 28-70mm lens on a full-frame camera.

Close focusing


Minimum focusing distance is just 28cm throughout the entire zoom range.

Superior optical performance


The EF17-40mm f/4L USM has 12 lens elements arranged in nine groups. Super Spectra coating ensures excellent colour balance and minimises ghosting and flare. To provide superb image quality over the complete 17-40mm zoom range the lens uses three aspheric elements. Super UD (Ultra-low Dispersion) glass prevents chromatic aberrations.

Ultrasonic focusing


A ring-type ultrasonic motor drives autofocus extremely quickly, and in near silence. Excellent holding torque ensures the point of focus is reached accurately, without overshooting. Furthermore, full-time manual override is available, making it possible to adjust focus without leaving AF mode.

Non-rotating front element


The front of the lens does not rotate, which makes using specialised filters, such as polarisers and graduates, easier. A drop-in gelatine-filter holder can be found at the back of the lens.

Smooth background blur


A virtually circular aperture diaphragm gives out of focus regions a softer, more uniform feel. Sharp foreground objects stand out against a smooth blurred background.

Weather resistant


Highly resistant to moisture and dust, the EF17-40mm f/4L USM is ideally suited for use in harsh environments. Environment friendly lead-free glass is used throughout its construction.

Awards

Product specification

Find out more about the Canon EF 17-40mm f/4L USM, its features and what it can do.

EF 17-40mm f/4L USM Ratings & reviews

  • bvseo_sdk, net_sdk, 2.3.0.0
  • CLOUD, getAggregateRating, 111ms
  • REVIEWS, PRODUCT
  • bvseo-msg: The resource to the URL or file is currently unavailable.;
;
  • bvseo_sdk, net_sdk, 2.3.0.0
  • CLOUD, getReviews, 32ms
  • REVIEWS, PRODUCT
  • bvseo-msg: The resource to the URL or file is currently unavailable.;
;

Can we help you choose your next lens?

Our lens selector will take you through our range of lenses and help you find the perfect match for you and your EOS camera.

Find your perfect lens

Lens Guru Mobile App

Understand the basics of photography, and discover how changing lenses can make a difference to your pictures.

Find out more

irista

Store your photos safely and in full-quality, sign up now for 15Gb free space.

irista