50i är antagligen 50 interlaced, det borde vara 25fps.
"50i signifies 50 fields per second. The actual framerate is 25 fps. Each frame is comprised of two fields (upper and lower field) and that's what makes it interlaced as apposed to progressive which uses no fields."
"Yes, 50i is just the new name for 25i. Blame the Marketing department. "