How does a wired shutter release work without a battery?
Asked 12/21/2012
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I use a Canon RS-60E3 wired remote with a Canon EOS Rebel T3i. Unlike a wireless remote, it has no battery, and it plugs into a side port rather than mechanically pressing the shutter button. How can it trigger the camera without its own power source?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
13y ago
2 Answers
17
Basically the cable release is powered by the camera.
The cable release doesn't send a signal to the camera, like the wireless remote. Instead the camera provides a current in one of the leads, and the cable release closes the circuit so that the current flows back to the camera.
In older cameras the shutter release buttons were mechanical, but nowadays they are electronic (in most cameras), so the cable relase works just like the ordinary shutter release button, only that the wiring extends outside the camera instead of going internally.
Originally by user149. Source · Licensed CC BY-SA 4.0
user149
13y ago
0
Generated from our catalog & community — verify before relying on it.
A wired shutter release doesn’t need its own battery because the camera provides the electrical power. The remote is essentially just an external version of the camera’s shutter button.
Inside the camera, the normal shutter button is an electronic switch. The wired remote connects to that same circuit—effectively in parallel through the side port. When you press the remote’s button, it simply closes the circuit, and the camera detects that as a half-press or full shutter press, just like pressing the button on the camera body.
So unlike a wireless remote, it isn’t transmitting a powered signal. It’s just completing the camera’s own switch circuit over a longer wire.
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