SIGMA DP2 - Manual (Page 63)

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[Center AF Lock]
Ensure the subject is within the center focusing point
and press the
button to activate and lock the
autofocus. Please note, only the center focusing
point will be used when the
button is pressed.
The exposure will only be locked when the shutter
button is depressed “half-way”.
[Center AF Lock + AEL]
Ensure the subject is within the center focusing point
and press the
button. This will activate and
lock the autofocus and exposure. Please note, only
the center focusing point will be used when the AEL
button is pressed.
HALF PRESSED AEL
It is possible to set the exposure lock when the shutter button is
pressed “half-way” or cancel the exposure lock.
The Half Pressed AEL mode can be set in [ Capture Settings]
(P.26) → [Half Pressed AEL].
OFF
The exposure will not be locked while pressing the
shutter button “half-way”. The exposure will be
determined when depressing the shutter button.
ON *
The exposure will be locked when the shutter button
is pressed ”half-way”. While pressing the shutter
button is “half-way”, the exposure will not change.