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Thanks for your advice Harry. I am able to fire the flash off camera so the channel number is OK and obviously the camera and flash unit are communicating ( when I remember to raise the built in flash ).
Where I have a problem is the external flash function and external flash C.Fn setting on the flash control menu on the camera. When I access these I get the "this menu can not be displayed. Incompatible flash or flash's power is tuned off" message. When flash is mounted on hotshoe these menus are available.
As I said in earlier post I wonder if the 600D wireless function is just for firing flash off camera ? To access external flash settings on camera will I need a cord or wireless trigger?
Pete ( the puzzled )
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