Very interesting. Thanks for doing those tests.
How did you turn the display off? Can you do that in a script?
As philmoz pointed out, using the display button or folding the display screen in on the G1X turns off manual focus and focus lock. You can fold it in while holding half_shoot, but it doesn't turn off the display until you let it up. On the sx260, there's no way to turn off the display.
There is a menu power save option to shut off the display on both cameras. The minimum time to shut off is 10 seconds. I believe it's saved as a parameter value. Interestingly, the camera comes back on still in manual focus mode! The could be a good option to use for time lapses with a long delay between shots, and still be able to hold the focus. It works the same on the sx260.
The shut down delay is listed as param #64 on the SD800http://chdk.wikia.com/wiki/ParamsIs there a way to set params? Maybe this delay could be set to 1 second. That way, it would turn off the display automatically between shots (when you release half_shoot).
I wonder if you could wire a DC ammeter into the external battery supply wires?
Pentax is the only waterproof camera I've been able to find that does what I want.
If the battery could make it 18-36 hours I think it could work.
If you can get 13 hours and 811 shots at 1 minute intervals by keeping the display off, you might do a even better with the display off and 1/10 the shot rate.
I think the only solution for the camera on times we're talking about is an external battery.
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