Sony ILCA-99M2 Manual page 282

Adjust the value for the center area.
3
The larger the value you select, the farther the autofocused position will be from the
product. The smaller the value you select, the closer the autofocused position will be to
the product.
To adjust the autofocus position for the dedicated phase detection AF area, set the
value for the center area.
If the adjustment for the center area is not needed, you can skip this step.
Adjust the values for the corner areas as necessary.
4
Set the values for the corner areas if the adjustment of the autofocused positions
outside of the dedicated phase detection AF are needed.
AF micro adjustment areas
Conceptual diagram
You can adjust the autofocus position for both the wide and telephoto ends of the lens. When
Hybrid Phase Detection AF is active*, you can adjust the autofocus points for the corner areas
(2 - 5) as well as the center area (1).
The adjustment for the center area is applied to both the focal plane phase detection AF
sensor and the dedicated phase detection AF sensor.
The adjustments for the corner areas are applied to the focal plane phase detection AF
sensor.
* When a lens that supports Hybrid Phase Detection AF is attached, and [AF System] is set to [Auto]
Hint
It is recommended that you adjust the position under actual shooting conditions. Set [Focus Area] to
[Flexible Spot] and use a bright subject with high contrast when you adjust.
Note
For focal lengths between the wide end and the telephoto end, the values interpolated by the values
for each end are applied.
For areas between the adjusted areas, the values interpolated by the values for each area are