Canon EOS 70DN Basic Instruction Manual page 127

Quick Mode: f
The dedicated AF sensor is used to focus in One-Shot AF mode (p.88),
using the same AF method as with viewfinder shooting.
Although you can focus the target area quickly, the Live View image
will be interrupted momentarily during the AF operation.
In AF area selection modes other than 19-point automatic selection AF,
you can manually select the AF point. In Basic Zone modes, 19-point
automatic selection AF is set automatically.
Area AF frame
1
Display the Live View image.
Press the <0> button.
The Live View image will appear on
the LCD monitor.
If the AF area selection mode is set to
19-point automatic selection AF, the
Area AF frame will be displayed.
With FlexiZone - Single (manual
selection), the AF point will be
displayed as a small frame.
With Zone AF (manual zone
selection), the frame indicating the
zone is displayed.
2 Select the AF area selection
mode and AF point. N
Press the <B> button to display the
current AF area selection mode.
Each time you press the <B> button,
the AF area selection mode changes.
When the AF area selection mode is
FlexiZone - Single (manual selection)
or Zone AF (manual zone selection),
you can select the AF point (or zone).
Using AF to Focus (AF Method)
127