Sony Alpha 7 III Help Manual page 290

Interchangeable lens digital camera

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Interchangeable Lens Digital Camera

Function Ring(Lens)

You can choose which of the following functions to assign to the function ring on the lens: power-assisted focusing

(power focus), or switching the angle of view between full frame and APS-C/Super 35 mm (available only with

compatible lenses).

This function can be used when the camera's system software (firmware) is Ver. 2.00 or later.

For details, refer to the operating instructions supplied with the lens.

(Camera Settings2) → [Function Ring(Lens)] → desired setting.

Menu item details

Power Focus:

The focusing position moves toward infinity when you turn the function ring to the right. The focusing position moves to

the closer range when you turn the function ring to the left.

/Full Frm Sel.:

The angle of view switches between full frame and APS-C/Super 35 mm when the function ring is turned.

The angle of view switches regardless of the direction in which you turn the function ring.