Variable Frame Rate shooting used to be only possible with film cameras; all electronic cameras worked at fixed frame rates. Panasonic’s HD Varicam was the first to offer variable speeds, originally with frame rates from 4 to 60 f/s in one-frame increments. Sony’s XDCAM HD offered the same range. There are also specialized digital cameras and solid-state recorders able to capture video at frame rates up to 1000 f/s, or more. Instant replay shows an otherwise unseen world of extreme slow motion.