SIGMA DP3 Quattro - Manual (Page 127)

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Set the Auto Power Off from [ Camera Settings] (P.27) → [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.
TIP

To disable LCD Off, set [ LCD Off] to [Off].

To disable Auto Power Off, set [ Auto Power Off] to [Off].
WARNING !!

It is not possible to set [ LCD Off] for a longer time than [Auto Power
Off]. For example, when [LCD Off] is set to [5min.] and [Auto Power
Off] is set to [1min.], the [LCD Off] setting will be changed to [1 min.]
automatically.
ECO MODE
ECO Mode saves battery usage by reducing the brightness of the LCD
monitor and frame rate when the camera has not been used for 10
seconds.
Set to [ On] from [ Camera Settings] (P.27) → [ECO Mode].
Off (Default) Set to Standard Mode.
On Set to ECO Mode.