FujiFilm X-T20 - Manual (Page 276)

256
P
eripherals and Optional A
c
c
essories
10
External Flash Units
Flash units can be mounted on the hot shoe or
connected via the sync terminal.
External fl ash units are more powerful than their
built-in counterparts. Some support high-speed
sync (FP) and can be used at shutter speeds faster
than the sync speed, while others can function as
master fl ash units controlling remote units via optical
wireless fl ash control.
O
You may be unable to test-fi re the fl ash in some circum-
stances, for example when a setup menu is displayed on
the camera.