This new type of telephoto lens makes the entire lens system as simple as possible, reduces the weight of the actual glass and utilizes Canon’s own rear focusing system, offering reduction in overall weight and excellent operability and mobility.

The rear focusing system in which focusing is performed by moving the rear lens group back and forth provides lighter and smoother focusing than ordinary telephoto lenses, in which the entire lens system is extended. In addition to this, the system provides numerous advantages such as excellent operability due to good balance with the camera body, which is because the overall length of the lens does not change even when focusing, and a shorter minimum shooting distance.

Furthermore, the use of new optical design technology to provide ideal power distribution ensures aberrations are properly compensated for while keeping the lens in its simplest form, offering high-resolution and high-contrast image quality. In particular, changes in aberration at close shooting are almost completely eliminated through the use of the rear focusing system, successfully obtaining uniform high definition throughout the entire frame from close to far distances.