Is there any way that can save more power let my camera can last about 1 week?
Turning off the LCD does not save much power, you need to turn off the sensor.
Even then, it is not going to last one week.
I know the AC adapter can let my camera to hold for such long period of time
You can plug your AC adapter into one of these :-
Ebay # 120867614459 (which I have just bought ) or 280704214668 (for 110V AC).
The second one is easier to modify, you cut the lead and connect to sealed lead-acid battery :-
Ebay # 120763733719
Incidentally, at one photo every twelve hours , one week will playback in 0.5 seconds.
A far more efficient way to save power is to turn the camera on every 12 hours.
You use a radio-control servo to press the shutter button :-
http://forums.dpreview.com/forums/readflat.asp?forum=1058&message=40415998&changemode=1You need someone to make a circuit that sends suitable pulse widths to the servo every twelve hours.
On power-up, a script is run that zooms to required setting, takes a photo and then shuts down.
Quite simply, there is no problem getting this working but it does entail some effort and expense.
