Optocoupler question

danrogers said:

I have some of these https://www.fairchildsemi.com/ds/MO/MOCD208-M.pdf that I want to use to trigger my camera's shutter release.

Just trying to work out how to use them because I new to this type of device. They will be activated with a 5v supply - how much do I need to drop that too to power the infra-red diode?

thanks

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