You can focus without pressing the shutter button halfway down. The settings for the focus mode dial will be applied.
- MENU→(Camera Settings2)→[Custom Key(Shoot.)]→desired key, then assign the [AF On] function to the key.
- Press the key to which you have assigned the [AF On] function while auto-focus shooting.
- Set [AF w/ shutter] to [Off] when you do not want to perform auto focusing using the shutter button.
- Set [AF w/ shutter] and [Pre-AF] to [Off] to focus at a specific shooting distance predicting the position of the subject.