Review Canon null Buy Canon EF 24-70mm f/4L IS USM Lens featuring EF-Mount Lens/Full-Frame Format, Aperture Range: f/4 to f/22, Two Aspherical and Two UD Elements, Super Spectra Coating, Ring-Type Ultrasonic Motor AF System, Optical Image Stabilizer, Macro Position with 0.7x Magnification, Weather-Sealed Design, Fluorine Coating, Rounded 9 The Canon 24-70mm f/4L IS USM 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. Just a quick review here after doing quite a bit of varied shooting with this lens using the Canon 6D only. For those wanting the best performance out of it, i.e. most sharpness and least amount of distortions, shoot f/5.6 and higher. Iv2v.