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A remote shutter release cable allow us to take pictures witout toutching the camera, this avoids creating vibrations when we touch the camera to shoot.
This is quite simple, most Canon machines has a 2.5mm input stereo jack (with 3 conductors) for connecting a remote trigger, works as an electric switch.
According to the scheme below, when the wire X comes into contact with Z the camera will shoot, Y with Z makes focus. It's possible to simulate the camera button, half click to focus and full click to shoot.


Wire connections of a remote shutter release cable
If the objective was set to focus, the camera will always focus before shoot.
It's desirable to have a switch that maintain contact with X-Z to take advantage of the camera "Bulb" mode.
This is possible because the camera has a jack plug for this purpose, some models has a different plug.
With a clip or the ring of soda can we can improvise something to work as a switch

Improvise a switch from a clip
Components:
- A cable with 3 wires (2 at least)
- One or two press buttons, for focus and shutter
- One switch, when in bulb mode
- 2.5mm Jack connector
- something to hold this coponents
For better result you can put all elements into a box or similar.

Components needed to mount a remote shutter release cable
For the first tests I started to mount a device using two plastic stoppers
Puting all in a plastic stopper (click to enlarge)
The design was not the better, I resolve to put in something better to hold on hands, like a tube and after that I turn it more fancy with a retro filme label.

Puting in a a glue tube