Sony ILCA-99M2 Manual page 153

HVL-F60M, HVL-F43M and HVL-F32M can be used as clip-ons, off-camera connected by a
cable, and for wireless flash shooting (controller/remote).
HVL-F20M can be used as a clip-on, off-camera connected with a cable, and for wireless
flash shooting (controller).
Note
The FEL lock cannot be set when a flash is not attached.
If a flash that does not support the FEL lock is attached, an error message is displayed.
When both AE and FEL lock are fixed,
Hint
By setting [FEL Lock hold], you can hold the setting while the button is pressed down. Also, by
setting [FEL Lock/AEL hold] and [FEL Lock/AEL tggle.], you can shoot images with the AE locked in
the following situations.
When [Flash Mode] is set to [Flash Off] or [Autoflash].
When the flash cannot go off.
When using an external flash that is set to manual flash mode.
[135] Shooting Using the flash
Flash control
Sets the method for determining the intensity of flash output.
MENU →
1
Menu item details
ADI flash:
The camera's flash control uses the focus distance information and brightness value of the
subject when the pre-flash is reflected.
This gives precise flash control without hardly being affected by the reflective level of the
subject.
Pre-flash TTL:
The camera's flash control uses the brightness value of the subject when the pre-flash is
reflected. If this setting is used, the camera's ability to precisely measure the flash light may be
affected by reflections from the subject.
ADI: Advanced Distance Integration
P-TTL: Pre-flash, Through the lens
(Camera Settings1) → [Flash control] → desired setting.
lights up.