Focus Preset

By presetting any focusing distance, you can instantly focus at that point even while you are shooting a different subject. This function operates in any of the AF, PF, and MF modes.
 

<How to Set>
		Set the focus preset switch to ON or .
		Press the shutter button halfway to focus the distance you want to preset.
		Press the focus preset button. The focused distance will be preset. If the focus switch was set to , the beeper will sound once.

<How to Focus at the Preset Distance>

By turning the playback ring to the left or right, the focus shifts as far as the preset distance.
Focus will shift freely released of AF focusing while the playback ring is still turned.

• If the focus preset switch was set to ​, the beeper will sound twice.

Setting the focus mode switch to power focus (PF) when using the lens with the EOS-1D X, EOS 5D Mark III, or EOS REBEL T4i/650D enables focus change at a slow set speed during movie shooting. Also, you can make a 2-step change in focus shift speed depending on the angle that the playback ring is rotated to.
 

In the following cases, the focusing distance scale will move slightly. It will not affect the image. When you press the focus preset button. When you turn the playback ring.

 

After the focus distance has been preset, turning the playback ring to a different zoom position or changing the internal extender setting will result in an out of focus picture. therefore, use the focus preset function after zooming is completed and the internal extender has been set. The focus preset function will not operate for a few seconds after setting the internal extender (the amount of time varies depending on the camera used). After setting the internal extender, please press the shutter button halfway before setting or using the focus preset. When turning the playback ring, keep your finger away from the shutter button. In One-Shot AF mode, the exposure will be locked when you press the shutter button halfway and focus is achieved. So if you press the shutter button halfway while turning the playback ring, the exposure may not be correct. When not using the focus preset, set the switch to OFF. The focus preset function will not work while a Live View image is displayed on the camera.*

* Not available to the EOS-1D X, EOS 5D Mark III, or EOS Rebel T4i/650D.