Canon 17-40mm f/4L USM Lens

The EF 17-40mm f/4L USM Lens is Canon L-series zoom featuring a constant f/4 maximum aperture along with a sophisticated optical design and durable construction. This wide-angle lens has one Super UD element, along with three aspherical elements, which help to reduce both chromatic and spherical aberrations in order to realize high sharpness, clarity, and color accuracy.