Sony α SLT-A58 Instruction Manual page 209

To change the mode
Fn button t
(On)
(Off)
Notes
• [Lock-on AF] may be difficult in the following situations:
– The subject is moving too quickly.
– The subject is too small or too large.
– The contrast between the subject and the background is poor.
– The subject is in dark lighting conditions.
– The ambient light changes.
• [Lock-on AF] cannot be used when the exposure mode is set to [Sweep Panorama],
[Tele-zoom Cont. Priority AE], or [Hand-held Twilight] in [Scene Selection], or
when manual focus is selected.
• The camera stops tracking a subject when the subject moves off the screen.
(Lock-on AF) t [On] or [Off].
Press the center of the control button on the recording
information display to display a target frame. Align the target
frame with the subject to be tracked, and press the center of
the control button. The camera starts tracking the subject.
When the subject is in focus, the target frame turns green. To
cancel the tracking feature, press the center of the control
button again.
Deactivates the [Lock-on AF] function.
Adjusting the focus
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