SIGMA DP3 Quattro - Manual (Page 74)

74
SPOT METERING
The camera will measure the brightness only inside of the selected
focusing point on the color LCD monitor. This mode is suitable when you
wish to set exposure for a portion of the scene and ignore the influence of
rest of the scene.
AE LOCK
The camera will fix and memorize the exposure value whilst the “AE” Lock
button is depressed. When you wish to lock the exposure of a subject
off-center, AE lock is very useful. Use of this function with Spot Metering
Mode is recommended.
1
Center the subject, for which you wish to
lock the exposure inside the color LCD
monitor and press the button. (With
spot metering, set the subject for which
you wish to lock the exposure to the
selected focusing point, and press the
button.)
The exposure value is memorized and
AEL is displayed in the upper part of the
color LCD monitor.
2
Compose the picture and press the shutter
button.

It is possible to continue taking pictures with the memorized exposure
value until this setting is disabled by pressing the button again.
SETTING THE AEL BUTTON
It is possible to use the button to select settings other than AE Lock
[ AEL].
The AE Lock can be set in [ Capture Settings] (P.27) → [AEL Button
Settings].