Sony ILCE-7M3 Help Manual page 510

Help Guide
Interchangeable Lens Digital Camera
ILCE-7M3
α7III
Dial Setup
You can switch the functions of the front/rear dial.
MENU → (Camera Settings2) → [Dial Setup] → desired setting.
1
Menu item details
Tv Av:
The front dial is used to change the shutter speed and the rear dial to change the aperture value.
Av Tv:
The front dial is used to change the aperture value and the rear dial to change the shutter speed.
Note
The [Dial Setup] function is enabled when the shooting mode is set to "M."
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