MFR# 0573C002. Canon EF 16-35mm f/2.8L III USM Lens. Along with all of this, the aperture diaphragm uses nine rounded blades to create smooth bokeh. Looking to take things up a notch, Canon's EF 16-35mm f/2.8L III USM Lens embraces a revamped optical design with modern coating technologies that promise improved outer and corner sharpness along with minimal distortion and enhanced peripheral illumination.
