Canon EF 17-40mm f/4L USM

Wide zoom

Canon EF 17-40mm f/4L USM

A high-quality, wide-angle zoom for a variety of subjects.

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.

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

Sample Images

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.

Product Specification

Angle of view (horzntl, vertl, diagnl) 93° - 49°20', 70°30' - 34°, 104° - 57°30'
Lens construction (elements/groups) 12/9
No. of diaphragm blades 7
Minimum aperture 22
Closest focusing distance (m) 0.28
Maximum magnification (x) 0.24 (at 35mm)
AF actuator USM¹
Filter diameter (mm) 77
Max. diameter x length (mm) 83.5 x 96.8
Weight (g) 500
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 EW-83E
Hard case -
Soft case LP1319
Extenders EF1.4x II and EF2x II Not compatible
AF actuator ¹ Mechanical full-time manual focusing built-in
Magnification - Extension Tube EF25 II ¹ Only compatible at tele

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