Max Shutter speed
Nikon Z6 can shoot continuously at max speed of 12.0 fps
and has max shutter speed of 1/8000 sec
Unfortunately Z6 doesn't have a built-in flash but it has a flash shoe for mounting external flashes.
Nikon Z6 features both Contrast Detection and Phase Detection autofocus (AF) systems which ensures speed and accuracy of focusing in most situations. The AF system has 273 points to choose from. Nikon Z6 also features Face detection AF
where it intelligently detects the faces in the frame and locks the focus automatically. In addition to the face detect AF, Z6 has a more sophisticated feature called Eye Tracking AF
which detects and locks focus to the selected eye of the person in the frame accurately and tracks as the subject moves. Eye tracking AF of Nikon Z6 is a perfect feature for shooting portraits and is especially useful when fast lenses are used and the depth of field is very narrow.
Macro shooters will love Nikon Z6's Focus Stacking feature. In this mode, Z6 automatically composites multiple shots taken at different focal positions using focus bracketing to create a single image with maximum depth of field.