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580EX II Speedlite : How to turn the Speedlite flash on and off.

Set the power switch to <ON>, the flash recycling starts. Check that the flash is ready

Troubleshooting: The Speedlite does not fire.

The batteries are installed in the wrong orientation Install the batteries in the correct orientation The Speedlite's batteries are exhausted If the flash recycling time takes 30 sec. or longer, replace the batteries. Install the Speedlite's batteries even when you use an external power source

Reset C.Fn-5 is set to 0 (E-TTL).

If an external power source is used, the flash recycling is powered concurrently by the batteries and the external power source. In this case, when the batteries become exhausted first, shooting might not be possible. If 1 is set, the flash recycling will be powered only by the external power source.

QuickGuide to Canon Integrated Speedlite Transmitter Operation

Ratio control between built-in flash and off-camera Speedlites Choose this option if you want the built-in flash to fire at one level of E-TTL power and the combined receiver unit(s) to fire at another. Note: Because the built-in flash is smaller and less powerful than an external Speedlite, the camera will not allow you to set ratios that would require the built-in flash to overpower the receiver units.

QuickGuide to Canon Speedlite 580EX II Modes and Functions

When your Speedlite is set to this option it will function as the Sender (main) unit that controls any other Receiver (secondary) units that are set to the same Channel. It will also allow you to control the automatic power ratio between Sender and Receivers.