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Compact, lightweight and ideal for on the go photography, the Canon EF 17 40mm f4L USM Ultra Wide Angle Zoom Lens produces a sterling optical performance with a constant maximum aperture ideal for a vast range of subjects. Optical excellence The EF lens offers an ultra wide angle zoom range on film or full frame digital EOS camera, the 17 40mm lens acts as a standard zoom when mounted on DSLRs equipped with APS C sized sensor giving an angle of view equivalent to a 28 70mm lens. Lens construction The advanced Canon optics has been developed with 12 lens elements arranged in nine groups. The Super Spectra lens coating works to ensure outstanding colour balance with minimal ghosting and flare. With three aspheric elements, the Canon EF wide angle lens provides stunning image quality over the 17 40mm zoom range, with the Super Ultra low Dispersion glass working to prevent chromatic aberrations. Focusing A close focusing distance of just 28cm throughout the entire zoom range means you can achieve stunning close up shots with beautiful background blur. The Canon EF 17 40mm lens has been constructed with an ultrasonic motor that drives a speedy focusing performance in near silence. The outstanding holding torque reaches the precise point of focusing, ensuring a consistently accurate performance. What's more, there is full time manual override ready and available, allowing you to make focus adjustments without leaving AF mode. Lens performance The front of the lens is non rotatable, this makes it easier to use specialised filters such as polarisers and colour graduates. There is a drop in gelatine filter holder located at the back of the EF lens. Integrated a virtually circular aperture diaphragm, the lens produces softer out of focus regions at a more uniform level. The sharp foreground objects strikingly stand out against the gorgeously blurred background. Weather resistant The Canon lens boasts a lead free glass construction, making it highly resistant to dust and moisture ideal for taking photos in rough conditions and challenging environments. Bolster your camera kit with the versatile, reliable and high performing Canon EF 17 40mm f4L USM Ultra Wide Angle Zoom Lens .
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