SIGMA DP3 Merrill - Manual (Page 117)

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LCD OFF AND AUTO POWER OFF
The DP3 Merrill has [LCD Off] and [Auto Power Off] functions in
order to conserve battery power. If not used for a predetermined
amount of time, the color LCD monitor or power will be turned off
automatically.
LCD Off
If not used for a predetermined amount of time, the backlight of the color
LCD monitor will be turned off automatically. Although the color LCD
monitor is turned off, the camera power remains ON, therefore, each
button can be operated normally. It is possible to change to shooting
mode, upon pressing the shutter button halfway.
Auto Power Off
If not used for a predetermined amount of time, the camera will be turned
off automatically. While the camera is in Auto Power Off, each button will
not function. It is necessary to press the Power switch to terminate Auto
Power Off.
Set the Auto Power Off from [ Camera Settings] (P.28) → [LCD
Off] and [Auto Power Off].
LCD Off Option Auto Power Off Option
Off Off
10 sec. 30 sec.
30 sec. 1 min.
1 min. (Default) 5 min. (Default)
5 min. 10 min.
10 min.
 icon is the recommended setting for conserving the electronic power.
TIP

To disable LCD Off, set [LCD Off] to [Off].

To disable Auto Power Off, set [Auto Power Off] to [Off].