An L-series lens aimed at professionals and enthusiasts, the Canon EF 70-200mm f/4L USM is a zoom telephoto great for a broad range of applications from sports to portraiture. The "L" in its designation stands for luxury and also means superb performance and robust build. Its optical construction has one artificial fluorite element and two UD (Ultra-low Dispersion) elements for outstanding contrast and minimized aberrations. The ring-type Ultrasonic Motor enables fast and quiet auto focusing, and permits full-time manual focus override even in AF mode. The inner focusing mechanism makes it easy to use polarizer as the front element doesn't rotate during focusing. Plus, being relatively lightweight and compact in its zoom range, the EF 70-200mm f/4L USM brings you more opportunities without weighing you down.
MTF Charts
Superb Optical Performance
This lens is made of 16 elements in 13 groups, including a Fluorite element with two UD-glass elements for outstanding contrast and performance.
Ultrasonic Motor
The Ultrasonic Motor delivers fast and quiet autofocus performance, which is particularly important to video recording.
Full-Time Manual
The full-time manual focusing enables photographers to manually tweak focus without switching out of the AF mode.
Inner Focusing
An inner focusing lens has the focusing lens group(s) in front of the diaphragm, which allows for compact optical systems that produce faster AF. And because the front of the lens does not rotate to focus, filter orientation remains stationary for unaffected effect.
