Bundle Items Include: 1 x Canon EF 17-40mm f/4L USM Lens, 1 x 77mm 3 Piece Filter Kit, 1 x Lens Cap Keeper, 1 x Cleaning Kit. 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.. Wide-angle zoom is designed for full-frame Canon EF-mount DSLRs, however can also be used with APS-C models where it provides a 27.2-64mm equivalent focal length range. Constant f/4 maximum aperture maintains consistent illumination throughout the zoom range. One Super Ultra-Low Dispersion glass element noticeably reduces color fringing and chromatic aberrations for high clarity and color