The Canon EF 17-40mm F4 L Lens is an affordable L-series ultra wideangle zoom lens that’s ideal for both film and digital SLRs. Superior optics are assured by the use of three aspherical lens elements, in addition to a Super UD (Ultra-low Dispersion) glass element. Optical coatings are optimized for use with digital cameras.
The Canon EF 17-40mm F4 L Lens focuses as close as 28cm, and offers both Canon’s full-time manual focus and a powerful ring-type USM for fast and silent AF. 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 three gel filters. Finally, it offers weather-resistant construction similar to other high-end L-series lenses.
Features of the Canon EF 17-40mm F4 L 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 Canon EF 17-40mm F4 L Lens 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 Canon EF 17-40mm F4 L Lens 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.
What’s in the box
- Canon EF 17-40mm F4 L Lens
- Lens Hood EW-83E
- Lens Cap E-77U
- Lens Dust Cap E
- Lens Case LP1319
- User Manual
Canon EF 17-40mm F4 L Lens Sample Images
Specifications of the Canon EF 17-40mm F4 L Lens
| Lens type | Zoom lens |
| Focal length | 17–40 mm |
| Image stab. | No |
| Lens mount | Canon EF |
| Max aperture | F4 |
| Min aperture | F22 |
| Min focus | 0.28 m (11.02″) |
| Max magnification | 0.24× |
| Weight | 500 g (1.10 lb) |
| Length | 97 mm (3.81″) |
For a more detailed specification see here. For more Canon Cameras see here.
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