Canon Speedlite 600EX-RT Instruction Manual - Page 39

//.: Flash External Metering .: Manual External Flash Metering You can manually set the Speedlite with the ISO speed and aperture set in the camera. The flash output is automatically adjusted according to the ISO speed and aperture that you set. 1 Set the flash mode to . Press the button and set to . If is not displayed, set the flash Custom Function to C.Fn-05-3 (p.96). 2 Set the same ISO speed as on the camera. Press function button 3 . X The ISO speed value is highlighted. Turn to set the ISO speed, and press the button. ISO speed can be set within a maximum range of ISO 25 to 51200, in 1/3 increments. 3 Set the same aperture as on the camera. Press function button 4 . X The aperture is highlighted. Turn to set the aperture, and press the button. You can check the effective flash range on the Speedlite's LCD panel. When using manual external flash metering and shooting with the camera and Speedlite's PC terminal connected by a commercially-available sync cord, you can shoot with the flash off the camera. If you connect a different Speedlite to the Speedlite's PC terminal with a sync cord, it will not fire. 37