Canon Speedlite 600EX-RT Instruction Manual - Page 46

Flash Control from Camera's Menu Screen Flash firing To perform flash shooting, set to [Enable]. To use the flash's AFassist beam only, set to [Disable]. E-TTL II flash metering For normal exposures, set it to [Evaluative]. If [Average] is set, the flash exposure will be averaged for the entire scene metered by the camera. Flash exposure compensation may be necessary depending on the scene. This setting is for advanced users. Flash synchronization speed in Av mode You can set the flash sync speed when shooting in aperture-priority AE (Av) mode with flash. Flash mode You can select the flash mode from [E-TTL II], [Manual flash], [MULTI flash], [AutoExtFlash] and [Man.ExtFlash] to suit your desired flash shooting. When the flash's Custom Function C.Fn-05 is set to [1:TTL] (p.96), [TTL] can be selected. When performing autoflash shooting with an EOS digital camera, set to [0:E-TTL II/E-TTL]. Shutter synchronization You can select the flash firing timing/method from [1st curtain], [2nd curtain] and [High-speed synchronization]. To perform normal flash shooting, set [1st curtain]. Flash exposure compensation In the same way as normal exposure compensation, you can set exposure compensation for flash. The flash exposure compensation amount can be set up to ±3 stops in 1/3-stop increments. FEB You can take three shots while automatically changing the flash output. The settable range is up to ±3 stops in 1/3-stop increments. 44