Canon EF 17-40mm f/4 L USM is a autofocus zoom lens with ultra-sonic motor for SLR cameras.
The optical scheme comprises 12 elements in 9 groups. Thanks to the 7-bladed aperture, the subjects located outside the depth of field are shown with very smooth features. Equipped with a silent ultrasonic motor providing fast and quiet autofocusing.
This lens has a size of 96.8 mm. This is a normal size, very convenient in everyday use. This lens weighs 500 grams, given the weight of the camera, it may deliver long wearing problems. The lens is suitable for shooting near objects. Mounting the filter has a common size. Canon EF 17-40mm f/4 L USM went on sale in 2003.
May be available from: Amazon.com, Amazon.co.uk, eBay.com, eBay.co.uk.
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