Sony HVL-F42AM - Manual (Page 31)

Appl
ica
tions
31 GB
AF illuminator
In low-light or when subject contrast is low, when the shutter button is pressed
partway down for Auto Focus, the red lamp on the front of the flash unit will light.
This is the AF illuminator used as an aid in Auto Focus.
• The AF illuminator operates even when the Flash-OFF lamp [ ] is lit.
• The camera AF illuminator does not operate while the flash AF illuminator is
operating.
• The AF illuminator does not operate while Continuous AF is used in focusing
mode (when continually focusing on a moving subject).
• The AF illuminator may not operate if the focal length of the lens is greater than
300 mm. The flash unit will not operate when removed from the camera.