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I can't find it anywhere in my manual or the custom functions. For instance, it is showing the ratio of 1:4 instead of the power  output of 1/4 power. I am using a Mark III. Thank you! 
New to the 600s and can't figure out how to turn off the flash so the on camera one won't fire so I can basically use it as a trigger only to set off an off camera 600.