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See also the Autofocus Customization Sony A7R III and Siblings page.
All of this is still valid for the A7R III but its additional 4-way scrolling controller frees up some buttons. In general, there are more buttons than I can need or memorize, so I recommend setting all buttons to off to start, then programming in what is needed.
This page discusses how to customize the C1/C2/C3/C4 buttons and 4-way controller for the Sony A7R II and its siblings:
- There are 4 custom function buttons: C1/C2 (top of camera), C3 (top rear), and C4 bottom rear.
- Buttons C1 and C2 on top of the camera are most easily accessed with the hand ready to shoot, so use those two for the most frequent needs.
- The 4-way controller, with its central button and 4-way directional buttons.
- The (new to A7R III) directional controller just below the AF-ON button. The ideal use of this 4-way button controller is for scrolling the AF point—much faster and easier direct control of the focusing point.
- The button as well as focus buttons on certain lenses.
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