Canon calls this the CANON ZOOM LENS EF 24-70mm f/2.8 L USM. EF means "electronic focus," meaning that there is an autofocus motor in the lens itself. All Canon lenses since 1987 have been EF. L only means as expensive as L; it means nothing technically.
2. Canon EF 24-70mm f/4L IS USM Lens. As was mentioned earlier, the 24-70mm is a popular choice for a standard zoom lens. Our top two rated lenses are 24-70mm lenses made by Canon. This one is the runner-up and comes with a maximum aperture of f/4, as compared to the f/2.8 of our top-rated lens. The size and weight of the Canon EF 24-70mm f/4L IS USM Lens are such that this lens is New Listing Used Canon EF 24-105mm f/4 L IS USM Lens with Hood. $95.91. 1 bid. $13.74 shipping. Canon EF 24-70mm f/2.8L USM Standard Zoom Lens for Canon SLR Cameras. Een veelzijdig standaardzoomobjectief, uitermate geschikt voor full-frame EOS-camera's en uiteenlopende onderwerpen. Een veelzijdig 24 - 70 mm f/4-objectief uit de L-serie met macromodus voor maximaal 0,7 x vergroting. Met ultrasoon AF kun je snel en vrijwel geluidloos scherpstellen. OrPG0.