The EF 24-70mm f/4L IS USM is a Canon L-series lens covering wide-angle to short telephoto focal lengths and featuring a constant f/4 maximum aperture. An advanced optical layout comprises two ultra-low dispersion elements and two aspherical elements to minimize a variety of aberrations and distortion in order to realize notable sharpness and clarity. A Super Spectra coating has also been applied to suppress lens flare and ghosting for greater contrast and color accuracy. the lens is also characterized by its ring-type USM and internal focusing mechanism to enable quick, quiet, and precise autofocus performance along with full-time manual focus override. A dedicated macro position also enables focusing as closely as 7.9" away in order to achieve a 0.7x magnification for photographing close-up subjects. A four-stop-effective Image Stabilizer is also used to minimize the appearance of camera shake for sharper handheld shooting. Constant f/4 maximum aperture maintains consistent illumination throughout the zoom range. Two aspherical elements minimize spherical aberrations and distortions for improved sharpness and accurate rendering. An Optical Image Stabilizer helps to minimize the appearance of camera shake by up to four shutter speed stops to better enable working in low-light conditions and with slower shutter speeds. A minimum focusing distance of 1.2' is available throughout the zoom range and a dedicated macro position can be used to achieve a maximum magnification of 0.7x in conjunction with a minimum focusing distance of 7.9".A protective fluorine coating has been applied to the front and rear element to resist fingerprints and smudges and to make cleaning these elements significantly easier.
Canon EF 24-70mm F/4L IS USM Specs