Speedlite 600EX-RT: Custom functions

The Speedlite 600EX-RT has many custom and personal functions that allow you to modify the way the flash works to suit your needs. If you make changes to these settings, but find the flash is not behaving as you expect it to, check the shooting mode you are using – if you are in the BASIC or ‘Image Zone’ modes, the CFn and PFn on the flash will not function. Instead, switch the camera to one of the creative zone modes – P, Tv, Av, M or Bulb.