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Specifications for the EF 17-40 f/4L USM The EF17-40mm f /4 L USM was developed as high-end version of the highly acclaimed EF20-35mm f / 3.5 -4.5 USM lens released in March 1993. Designed for use by professional and amateur users alike, this lens realizes the outstanding image resolution that distinguishes an L-series lens while retaining high cost performance.
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