600EX Flash - 5D III. Flash exposure compensation.

How can I set the FLASH exposure compensation from the CAMERA. It appears that I have to set the exposure compensation on the back of the flash unit. I would like be able to change the FLASH EC settings from the camera, not the flash unit.
Solved!
Go to Solution.

Ok, I have my 5D III out with my 600EX-RT mounted.
Let's make sure you don't have terminology confused.
There are two different compensations... there's "explosure compensation" and "flash exposure compensation".
If you meter exposure with the camera and then use the rear dial (assuming you did not disable it) after waking up the metering system then the rear dial will change the "exposure" compensation (this changes the metering for the AMBIENT light reading that the camera reads -- ignoring the flash). So changing "exposure compensation" will not change the flash even if the flash is powered on and connected. It would only change the camera.
On the top of the camera, just in front of the top LCD screen, there are four buttons. One has a dimple on it. That button is the ISO & "flash exposure compensation" button. If you press that button, then the rear LCD screen should show you that the rear dial will control "Flash exposure comp." Turning the rear dial at that point will make the adjustment show initially ONLY on the camera LCD screen... UNTIL you press the 'Set' button in the middle of the dial. Once you do that, the rear LCD screen on the flash will show that you have the flash exposure compensation enabled (it will ONLY show this when you wake up the metering system... if the metering system is allowed to go inactive the flash will only display the netural compensation... but as soon as you re-activate metering it will display your exposure compenation as set on the camera.
Also... on the rear LCD screen there's a box just below the ISO setting that shows if you have flash exposure compensation set and the amount.
This is all being controlled only by the camera -- I'm not using the menu buttons on the flash itself.
IF I DO use the buttons on the flash to set flash exposure compensation then the camera is locked out. It will report what compensation has been set on the flash, but will not let me change it until I use the buttons on the flash to return it to 0.
Does that help and are you able to do this with your flash?
Tim Campbell
5D II, 5D III, 60Da

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600EX Flash - 5D III. Flash exposure compensation.

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