Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 520

[Eye AF] by custom key
The Eye AF function can also be used by assigning [Eye AF] to a custom key. The camera can focus on eyes as long as
you are pressing the key. This is useful when you want to temporarily apply the Eye AF function to the entire screen
regardless of the setting for [Focus Area].
For instance, if [Focus Area] is set to [Flexible Spot] and you want the camera to focus on an eye outside of the focusing
frame, you can apply the Eye AF function by pressing the custom key to which [Eye AF] has been assigned, without
changing [Focus Area].
1.
(Camera Settings2) → [
MENU →
key.
2.
MENU → (Camera Settings1) → [Face/Eye AF Set.] → [Subject Detection] → desired setting.
3.
Point the camera at the face of a human or animal, and press the key to which you have assigned the [Eye AF]
function.
4.
Press the shutter button while pressing the key.
Hint
If you want the face or eye detection frame to disappear within a certain period of time after the camera has focused on the face
or eye, set [AF Area Auto Clear] to [On].
To detect animal eyes, arrange the composition so that both eyes and the nose of the animal are within the angle of view.
Note
When [Subject Detection] is set to [Human], the eyes of animals are not detected. When [Subject Detection] is set to [Animal],
human faces are not detected.
When [Subject Detection] is set to [Animal], the following functions are unavailable.
[Lock-on AF]
[Center Lock-on AF]
[Face Prty in Mlti Mtr]
[Regist. Faces Priority]
The [Eye AF] function may not function very well in the following situations:
When the person is wearing sunglasses.
When the front hair covers the person's eyes.
In low-light or back-lit conditions.
When the eyes are closed.
When the subject is in the shade.
When the subject is out of focus.
When the subject is moving too much.
If the subject is moving too much, the detection frame may not be displayed correctly over their eyes.
Depending on the circumstances, the eyes cannot be focused.
When the camera cannot focus on human eyes, it will detect and focus on the face instead. The camera cannot focus on eyes
when no human faces are detected.
The product may not detect faces at all or may accidentally detect other objects as faces in some conditions.
The Eye AF function is unavailable when the mode dial is set to
Custom Key] → desired key, then assign the [Eye AF] function to the
(Movie) or
429
, or during movie shooting.