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 is featured, along with three aspherical elements, which help to reduce both chromatic and spherical aberrations in order to realize high sharpness, clarity, and color accuracy. A Super Spectra coating has also been applied to suppress flare and ghosting for improved contrast in difficult lighting conditions. Complementing the imaging capabilities, this wide-angle zoom also features a ring-type USM and internal focusing mechanism to afford quick, quiet, and accurate autofocus performance, as well as full-time manual focus override. Additionally, this lens is weather-sealed for use in trying environmental conditions. Included: Canon EF 17-40mm f/4L USM Lens Manufacturer Accessories: E-77 II 77mm Lens Cap Lens Dust Cap E (Rear) Canon EW-83E Lens Hood Canon Lens Case LP1319 Bundle Accessories: 3 Piece Multi Coated HD Filter Kit 67mm (UV, CPL, FLD) High Speed SD Card Reader Lens Cap Keeper High Quality Lens Cleaning Pen High Quality Dust Blower Starter Cleaning Kit Microfiber Cleaning Cloth