I'm trying to take photos with my arduino and a 4n25 opto. To trigger my camera you only need to close the circuit of the shutter cable, however the below simple circuit is not working. I've tried to change the shutter cable with a led and 3v and it works perfectly. I added a switch(SW3) to make sure it worked as expected when closing the circuit, which it does.
I've tried also changing the R2 resistor to 330, 220 and 84 Ohms, all of them work nice lighting a led but no luck with the camera.
Is there something I'm missing? Maybe a reason which makes impossible to close the shutter circuit with a transistor?
Any help would be greatly appreciated.