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

Canon EF 17-40mm f/4L USM Lens 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. Benefits Superb optical performance throughout the zoom range Fast autofocus speed Highly resistant to dust and moisture 28cm minimum focusing distance at all focal lengths Detailed Features Take a look at a more detailed look into the Canon EF 17-40mm f/4L USM 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. Canon EF 17-40mm Close focusing Minimum focusing distance is just 28cm throughout the entire zoom range. Canon EF 17-40mm 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. Canon EF 17-40mm 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. Canon EF 17-40mm 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. Canon EF 17-40mm 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. Awards DSLR-Zone.com Lebanon Number 1 Camera Store