Recently I have received my super capacitors from
here 4F each and I tried to connect it to my Canon camera with starting voltage of 3.3V.
It's not working!
After I disconnect power supply voltage drops very fast from 3.3V to 2.5V and camera shuts down immediately. With that capacitors it should last at least couple of seconds.I don't have any explanation about it. I do my measurement with the help of multi meter. If I would have oscilloscope I would get an answer why it's not working.
Yesterday I tried the following circuit from
here and it seems to work much better. In my case i just use 3.3V instead of 12V.
Voltage drops very nice and camera continues to work down to 3.1V.
I will write the script that abort video and shooting functions and shuts down camera nicely after the switch from the circuit is off.
Basically I do all that things because I cannot use native camera on/off button and I need to use external switch.