Canon Speedlite 600EX-RT Instruction Manual - Page 18

Turning on the Power 1 Set the power switch to . X The flash recycling starts. 2 Check that the flash is ready. The flash-ready lamp changes in order from off to green (Quick Flash ready) to red (fully charged). Press the flash-ready lamp (test flash button) to fire a test flash. About Quick Flash The Quick Flash function enables flash shooting while the flash-ready lamp is green (before the flash is fully charged). The guide number is 1/2 to 1/6 of the full output, but it is useful for shooting with a faster recycling time at a short shooting distance. Set the drive mode to single shooting. You cannot use Quick Flash when continuous shooting, FEB, manual flash or stroboscopic flash is set. About Auto Power Off To save battery power, the power will turn off automatically after approx. 90 sec. of idle use. To turn on the Speedlite again, press the camera's shutter button halfway, or press the test flash button (flash-ready lamp). During radio transmission wireless master flash shooting (p.59) or during linked shooting (p.73), the time until auto power off takes effect is 5 min. Quick Flash cannot be used when the flash mode is set to . 16