The 24-70 lens is characterized by its sophisticated optical design, which includes one Super UD element and two UD elements, which reduce color fringing and chromatic aberrations in order to realize a high degree of color accuracy and clarity.  The 24-70 is considered a workhorse of a lens due to its ability to range from wide-angle to portrait length, it is also distinguished by its constant f/2.8 maximum aperture to benefit working in difficult lighting conditions and to afford greater control over depth of field.
 
F2.8/82mm front/CF/1.77 lbs