Max Shutter speed
Sony A7R IV can shoot continuously at max speed of 10.0 fps
and has max shutter speed of 1/8000 sec
Unfortunately A7R IV doesn't have a built-in flash but it has a flash shoe for mounting external flashes.
Sony A7R IV features both Contrast Detection and Phase Detection autofocus (AF) systems which ensures speed and accuracy of focusing in most situations. The AF system has 567 points to choose from. Sony A7R IV 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, A7R IV 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 Sony A7R IV is a perfect feature for shooting portraits and is especially useful when fast lenses are used and the depth of field is very narrow.