Sample Wireless Flash System You can easily set up an E -TTL autoflash system with the 550EX, ST- E 2 or MR-14EX as the sender unit and the 420EX as the receiver unit. Just set the 420EX's wireless selector to <receiver> and position the receiver unit(s) as desired within the wireless transmission range
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
With the 420EX attached to a camera body equipped with a depth of field preview button, you can fire a modeling flash to check the shadow effects on the flash or the lighting balance in the wireless flash system before you take the picture. Set the wireless selector to the <SLAVE> setting
If the lens focal length is 105mm or longer, the 105 autozoom position indicator lights When the wireless selector is set to <SLAVE> the flash coverage is set automatically to 24mm
