You can set the flash output from 1/64 power to 1/1 full power in full-stop increments Use a hand-held flash meter to determine the required flash output to obtain a correct flash exposure. Be sure to first set the camera's shooting mode to Av or M
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
Custom Function Settings C.Fn-02-113: Convenient when you want to use the depth-of-field preview button to check the depth of field. C.Fn-08: If the Speedlite or camera's AF- assist beam is disabled, the AF- assist beam will not be emitted.
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.
