Quattro dp0 - Speed Priority Af; Half-Pressed Af-On

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SPEED PRIORITY AF
The Speed Priority AF enables faster autofocus by freezing the LCD
monitor while focusing.
Normal AF mode can be switched to Speed Priority AF mode by selecting
[ Capture Settings] (P. 2 8 ) → [Speed Priority AF] → [On].
CAUTION !!
 As the LCD monitor freazes while the the camera is autofocusing, a still
image will be dispayed when the shutter button is pressed halfway until
the AF is finished.
 To return to normal AF mode, select [ Capture Settings] (P. 2 8) →
[Speed Priority AF] → [Off].
HALF-PRESSED AF-ON
It is possible to select whether or not to operate the AF function when the
shutter button is half-pressed.
The Half-pressed AF-ON can be set in [ Capture Settings] (P.28) →
[Half-pressed AF-ON].
Off
AF function does not operate when the shutter button is
half-pressed.
On
(Default)
AF function operates when the shutter button is
half-pressed.
When [Half-pressed AF-ON] is selected as [Off] while the button is
set as [AF-ON], the auto focusing will be isolated from the shutter button.
Please refer to [SETTING THE AEL BUTTON] in P. 7 6 for the details of the
button settings.