Max Shutter speed
Fujifilm X100F can shoot continuously at max speed of
8.0 fps and has max shutter speed of
1/4000 sec. X100F also has an electronic shutter which can shoot silently at max speed of
1/32000s. One thing to keep in mind is that electronic shutter may cause rolling shutter / jello effects, and also banding issues under artificial light on your images.
Flash
X100F has a built-in flash, and it also has a flash shoe to mount your external flashes too.
Focusing
Fujifilm X100F features both Contrast Detection and Phase Detection autofocus (AF) systems which ensures speed and accuracy of focusing in most situations. The AF system has 325 points to choose from.
Fujifilm X100F also features
Face detection AF where it intelligently detects the faces in the frame and locks the focus automatically.