AVer DL10 Manuel page 28

Focus
Preset Position
Switch to auto (AF) or manual (MF) focus. The manual focus use
"+" and "–" to adjust focus. Select "+" to adjust focus to the far end
and focusing on a far subject; select "-" to adjust focus to near end
and focusing on a near subject.
One push focus: By clicking the
focus automatically once.
Select the number to view preset positions. User can also enter
preset position number (0~255) in "Go to" column directly for a
quickly calling section.
18
button to adjust Lens