Canon EF 16–35mm f/2.8L III USM Lens

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Features: EF-Mount Lens/Full-Frame Format Aperture Range: f/2.8 to f/22 Three Aspherical and Two UD Elements SWC, Air Sphere, and Fluorine Coatings Ring-Type Ultrasonic Motor AF System Weather-Sealed Construction Rounded 9-Blade Diaphragm The EF 16-35mm f/2.8L III USM from Canon is a workhorse wide-angle zoom and member of the well-regarded L-series of lenses. Featuring a series of specialized elements, this lens utilizes a trio of aspherical elements and two ultra-low dispersion glass elements