The roles played by each of the seven function buttons can be selected by pressing and holding the button. The default options are shown below:
Fn1 button (movie recording)

Fn2 button (AF mode)

Fn3 button (bracketing and advanced filters)

Fn4 button (film simulation)

Fn5 button (flash mode)

Fn6 button (focus-frame selection)

Fn7 button (wireless options)
