To assign roles to the function buttons, press and hold the DISP/BACK button until the menu below is displayed. Select buttons to choose their roles.
The options available include:
To disable the selected button, choose NONE.
The roles played by the six function buttons can also be selected using BUTTON/DIAL SETTING > FUNCTION (Fn) SETTING.
Viewing Function Button Options
You can also display options for any of the function buttons by pressing and holding the button (but note that in focus mode M, pressing and holding function buttons will instead display MF assist options). The above does not apply to any button to which FOCUS CHECK is currently assigned.
If TTL-LOCK is selected, you can press the control to lock flash output according to the option selected for FLASH SETTING > TTL-LOCK MODE.
If MODELING FLASH is selected when a compatible shoe-mounted flash unit is attached, you can press the control to test-fire the flash and check for shadows and the like (modeling flash).