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
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 |