Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 586

Help Guide
Interchangeable Lens Digital Camera
ILCE-7RM3A
α7RIII
AF drive speed (movie)
You can switch focusing speed when using autofocus in movie mode.
MENU → (Camera Settings2) → [ AF drive speed] → desired setting.
1
Menu item details
Fast:
Sets the AF drive speed to fast. This mode is suitable for shooting active scenes, such as sports.
Normal:
Sets the AF drive speed to normal.
Slow:
Sets the AF drive speed to slow. With this mode, the focus switches smoothly when the subject to be focused is
changed.
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