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After achieving focus with One-Shot AF, you can lock the focus on a subject and recompose the shot. This is called "focus lock". This is convenient when you want to focus on a peripheral subject not covered by the Area AF frame.
Example of Focus Lock
In normal autofocus settings, if you want to take a picture by focusing on the nearest flower, the focus is usually on the leaves at the center as shown in the left picture.
In such cases, use Focus Lock to focus on the target subject as shown in the right picture.
 |  |
| Normal Auto Focus | With Focus Lock |
Shooting with Focus Lock
In the [ 
The procedure for shooting with one-shot AF in the Creative Zone modes [ P / Tv / Av / M / B ] is explained in the following sections.
1. Set the lens focus mode switch to [AF].
2. Set the camera's power switch to [ON].
3. Set the Mode Dial to [ P / Tv / Av / M / B].
4. Press the [DRIVE・AF] button.
5. While looking through the viewfinder or at the LCD panel, turn the [ 
6. Press the shutter button halfway to autofocus.
] in the viewfinder will also light up.7. While you hold down the shutter button halfway, the focus will be locked. You can then recompose the shot if desired.
8. Press the shutter button completely to take the picture.
Caution
] in the viewfinder will blink. If this occurs, the picture cannot be taken even if the shutter button is pressed completely. Recompose the shot and try to focus again, or refer to Difficult subjects for AF (Auto Focus) (EOS 5DS / EOS 5DS R).
: Beep] is set to [Disable], the beeper will not sound when focus is achieved.