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Home > For Home > Product Finder > EF Lenses > Wide zoom > EF 17-40mm f/4L USM
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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
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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.
| 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 |
Product Awards
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TIPA Award 17-40mm f/4L USM
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