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The Canon EF 17-40mm f/4.0L USM is a lightweight zoom lens for Canon single-lens reflex camera with a full frame or APS-C sensor APS-C sensor. Due to its wide-angle, the lens is suitable for interior and landscape photography. The Super UD lens elements prevent optical errors, such as chromatic abberation and the coating minimizes troublesome reflections. The lens is dust and splash water resistant, and can be used in several weather conditions. It also has a fast and silent autofocus, so that you won't scare your subject while taking photos. It focusses at a distance of at least 28cm. This way, you'll give attention to the foreground of your composition as well.
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