You can focus using any button instead of pressing the shutter button halfway down. The settings for [Focus Mode] will be applied.
- Select the desired key and assign the [AF On] function to it using MENU → (Custom Settings) → [Custom Key Settings].
- Press the key to which you have assigned the [AF On] function while auto-focus shooting.
- You cannot set the [AF On] function to [Left Button], [Right Button] or [Down Button].