Sony DSLR-A850 - Manual (Page 60)

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• The AF illuminator does not operate when the focus mode is set to
Continuous AF or the subject is moving in Automatic AF.
• The AF illuminator does not operate when the center area is not selected
with [AF area] set to (Local).
• The AF illuminator may not operate with focal lengths of 300 mm or
longer.
• When a flash (sold separately) is attached, the AF illuminator of the flash
is used.
• You can deactivate the AF illuminator with [AF illuminator] in the
Recording menu (page 109).
You can set the distance of a subject.
AF illuminator
Press the shutter button halfway down, a
red illuminator is automatically emitted
until the focus is locked, according to the
situation.
When you shoot a subject under dark
conditions, or when you shoot a low
contrast subject, the AF illuminator
allows the camera to focus more easily on
the subject. AF illuminator
Shooting with Manual focus
1
Set the focus mode lever to MF.