Canon EF 17-40mm f/4L USM Lens

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Product Highlight: EF-Mount Lens/Full-Frame Format Aperture Range: f/4 to f/22 One Super Ultra-Low Dispersion Element Three Aspherical Element Super Spectra Coating Ring-Type Ultrasonic Motor AF System Weather-Sealed Construction Rounded 7-Blade Diaphragm In retail white box Spanning a versatile wide-angle range, the EF 17-40mm f/4L USM Lens is a Canon L-series zoom featuring a constant f/4 maximum aperture along with a sophisticated optical design and durable construction. One Super UD element