Coolpix L27 trigger mechanism
So by doing some poking around I found how it work myself



red pin are plugged to vcc wich is 3.3V
1 is auto focus
2 is trigger

to take a picture you have to put 3.3V on the autofocus pin
then 3.3v on the trigger pin.
Important, the autofocus still needs to be at 3.3V when you put 3.3V on the trigger pin.

Ps : be carefull with those nasty flash capacitor, my hands still hurts.