Sony ILCA-99M2 Manual page 320

[333] List of MENU items
AF Track Sens (movie)
You can set the AF sensitivity in movie mode.
MENU →
1
Menu item details
Responsive:
Sets the AF sensitivity to high. This mode is useful when recording movies in which the subject
is moving quickly.
Standard:
Sets the AF sensitivity to normal.
Locked on:
Sets the AF sensitivity to low. You can shoot with a stable focus by ignoring the influence of
anything in front of the subject.
[334] List of MENU items
Auto Slow Shut. (movie)
Sets whether or not to adjust the shutter speed automatically when recording movies if the
subject is dark.
MENU →
1
Menu item details
On:
Uses Auto Slow Shutter. The shutter speed automatically slows when recording in dark
locations. You can reduce noise in the movie by using a slow shutter speed when recording in
dark locations.
Off:
Does not use [ Auto Slow Shut.]. The recorded movie will be darker than when [On] is
selected, but you can record movies with smoother motion and less object blur.
Note
[ Auto Slow Shut.] does not function in the following situations:
During slow-motion/quick-motion shooting
(Shutter Priority)
Camera Settings2
(Camera Settings2) → [
Camera Settings2
(Camera Settings2) → [
AF Track Sens]→desired setting.
Auto Slow Shut.] → desired setting.