its basically 3:2 pull down, in other words if you are watch a pal movie @ 25fps on a 50hz set you would get the frames in this order: 11 22 33 44 55 66 77 88 99 how ever if u watch 24fps on a 50/60Hz set you get this order of frames: 11 22 333 44 55 666 that 3rd frame is what introduces the judder effect in non 24p comliant tv's