Step four: Position the flash wherever you like, as long as it's within line of sight of the camera. This stands for Evaluative Through The Lens, which is a Canon system that fires a small pre-flash before the actual flash goes off, in order to determine the exposure. You should see the front receiver start flashing, which means it's ready to receive a signal.

Make sure the channel is set to the same number as on your dSLR. This will bring up the channel and slave options. For models like the 430 EX II, use the screen to set the flash as a slave unit by pressing and holding the Zoom button. On models like the 270 EX II, flick the physical switch to Slave. Step three: It's now time to get our flash unit on the same channel as the dSLR. Step two: Pop up the flash on your dSLR - don't forget this step otherwise your wireless system won't work! Make a note of the channel that the camera is using: this should be channel 1 by default. Then, scroll to Built-in flash settings and choose EasyWireless. This is usually found in the first page of the shooting menu (red camera icon). If you can't find the icon on the screen using the Q button method, simply press the menu button and scroll until you see the Flash Control option. There should be three options to choose from: normal flash firing, easy wireless flash and custom wireless flash. Press the Q button on the back of the camera to flick through the selections on the screen and scroll until you find the flash icon. Step one: Turn on your dSLR and choose one of the manual exposure modes (PASM).

A second speedlite (not essential if you only want to use one light).

Models include 270 EX II, 320 EX, 430 EX I and II, 580 EX I and II, 600 EX

A compatible speedlite that can be set to slave.

Canon dSLR with wireless flash control built-in.

Nikon users can click here for a separate tutorial covering the same steps. Here is how you can use your dSLR to trigger an off-camera flash in a few simple steps. Want to play with off-camera lighting but don't know where to start or what you need? Canon's wireless flash system makes it easy.

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