The EF 24-70mm f/4.0L IS USM Standard Zoom Lens from Canon is optimized for full-frame 35mm sensors, and another entry into Canon's high quality L-series of lenses. It has two Super Ultra-low Dispersion (Super UD) and two standard UD lens elements working together to minimize chromatic aberrations, and reduce color blurring around the edges of your subject
With nine circular blades, the lens' diaphragm delivers soft, pleasant bokeh background effects.