Sony ILCA-99M2 - Manual (Page 65)

When a dedicated APS-C size lens that supports Hybrid Phase Detection AF is attached
(A): Hybrid Cross AF Points
Focal plane phase detection AF (vertical detection) + dedicated phase detection AF (cross
detection*
2
, F2.8-sensitive)
(B): Hybrid Cross AF Points
Focal plane phase detection AF (vertical detection) + dedicated phase detection AF (cross
detection*
2
)
(C): Hybrid Cross AF Points
Focal plane phase detection AF (vertical detection) + dedicated phase detection AF (horizontal
detection)
(D): Focal plane phase detection points (vertical detection)
Auto focus area of the dedicated phase detection AF sensor
The dedicated phase detection AF sensor with 79 focus points is used for auto focusing when a
lens that does not support the Hybrid Phase Detection AF system is attached, or [AF System] is
set to [Ddc Phase AF Only].
The number of focus points is limited to 61 in the movie shooting mode.
Conceptual diagram
When 79 focus points are available
When 61 focus points are available
Cross detection focus points achieve high capturing performance by arranging horizontal detection points and
vertical detection points in a cross shape in the same focusing area. The focus point at the center is also
equipped with a F2.8-sensitive sensor that supports lenses with a minimum F-value of 2.8 or lower. *2