Auto Focus; Focus Area - Sony A7RIII ILCE-7RM3A Operating Instructions Manual

Auto focus

Focus Area

Selects the focusing area. Use this function when it is difficult to focus
properly in the auto focus mode.
MENU 
setting.
Wide: Focuses on a subject covering the whole range of the screen
automatically. When you press the shutter button halfway down in the
still image shooting mode, a green frame is displayed around the area
that is in focus.
Zone: Select a zone on the monitor on which to focus, and the product
will automatically select a focus area.
Center: Focuses automatically on a subject in the center of the image.
Use together with the focus-lock function to create the composition
you want.
Flexible Spot: Allows you to move the focusing frame to a desired
point on the screen and focus on an extremely small subject in a
narrow area.
Expand Flexible Spot: If the product cannot focus on a single selected
point, it uses focus points around the flexible spot as a secondary
priority area for focusing.
and held halfway down, the product tracks the subject within the
selected autofocus area. This setting is available only when the
[Focus Mode] is set to [Continuous AF]. Point the cursor at [Lock-on AF]
on the [Focus Area] setting screen, and then adjust the desired area to
start tracking using the left/right sides of the control wheel. You can
also move the tracking start area to the desired point by designating
the area as a zone, flexible spot or expand flexible spot.
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(Camera Settings 1)  [Focus Area]  desired
Lock-on AF: When the shutter button is pressed