interlaced vs progressive scan slow motion

Some slow motion cameras shoot interlaced video and some shoot progressive scan. I think interlaced video looks smoother than progressive scan when played at less than 30 frames per second. Some cameras define their high-speed frame rates in fields per second and some specify frames per second, and both are sometimes abbreviated as fps which only adds to the confusion. Fields per second refers to interlaced video, in which a frame of video is recorded in two separate scans of even rows and odd rows. Although this difference is not normally noticeable, the effect is especially visible in the still frames at the end of this video. A standard video camera shoots 30 frames per second (60 fields per second), and Sony HD cameras have a high-speed mode that allows you to record 240 fields per second (120 frames per second) while the Samsung SC-HMX20 and Sanyo Xacti HD1010 shoot at 300 fields per second (150 frames per second) in their respective high-speed modes. When a camera specifies frames per second,