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Specifications for the EF 17-40 f/4L USM Moreover, the power of the focusing lens group has been increased to allow a minimum focusing distance of just 0.28 meters throughout the entire zoom range. The EF17-40mm f/4L USM also features a circular diaphragm for improved background blur, and utilizes only lead-free glass optics in consideration of the environment.The new lens features a hardy water- and dust-resistant construction,ensuring professional users unfailing performance under even the most grueling of conditions.
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