Inner and Rear Focusing Systems - RF Lens World - Canon South & Southeast Asia

Inner and Rear Focusing Systems

The lens elements in AF lenses are moved into place by actuator motors. Because of this, the weight of each lens element has a big effect on how fast the lens can focus. Canon has made technologies for inner focus and rear focus designs that make lenses lighter by only allowing some of their parts (those that affect focus) to move. This change makes it easier to control autofocus quickly and accurately. The design also makes it easier to reduce the size of the entire optical system, which helps make the chassis smaller and the weight more evenly distributed so that it is easier to hold. The lens is also stronger and lasts longer because the whole thing is built together. The AF performance of the RF lens is an important part of figuring out the AF performance of the whole system, even though most people only look at the AF performance of the camera body.