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

The new and affordable L-series comes to life with the Canon EF 17-40mm f/4L USM, an ultra-wide-angle zoom lens that's perfect for both film and digital SLRs. Its Optical coatings are improved for use with digital cameras. High-class optics is guaranteed by the use of 3 Aspherical lens elements, an additional feature to a Super UD (Ultra-low Dispersion) glass element. The lens has a maximum aperture of 1:4 and 17 - 40mm focal length. Constructed to pro standards, it’s also highly resistant to dust and moisture. It has a ring type USM for silent and high-speed AF operation. It is compatible with APS-C and Full Frame Sensor DSLR Cameras.

Product Features in Detail

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.