Canon EF 17-40mm f4 L USM Lens
Product Code: 12832

Canon EF 17-40mm f4 L USM Lens

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The Canon 17-40mm f/4 USM is an affordable L-series ultra-wide-angle zoom lens that's ideal for both film and digital SLRs. This EF lens focuses as close as 0.28m. It has a constant f/4 maximum aperture, and offers the choice of screw-in 77mm filters or a holder in the rear of the lens for up to 3 gel filters. The 17-40mm f4L also features a wear-resistant construction.

Key Features: Canon EF 17-40mm f/4 L USM Lens

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

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 3 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.


Sample Image: Canon EF 17-40mm f4 L USM Lens

sample image
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Product Specification

Aperture Blades 7
Autofocus Motor USM
Colour Black
Filter Thread [mm] 77
Focal Length ~ Tele [mm] 40.0
Focal Length ~ Wide [mm] 17.0
Hood Model EW-83E
Image Stabilisation No
Included Accessories Lens pouch, Front and rear caps, Lens hood
Lens Elements 12
Lens Groups 9
Lens Mount Canon EF
Lens Type Wide-Angle Zoom
Max Aperture ~ Tele 4.0
Max Aperture ~ Wide 4.0
Max Magnification 1:4.2
Maximum Format Size Full Frame
MF Switch Full Time Manual Override
Minimum Aperture 22
Minimum Focus Distance [m] 0.30
Size 83.5 x 96.8 mm
Weight [g] 500.00
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Product Code: 12832-wex Manufacturers Part Number: 8806A007