I know what the zebra function does on my camera but I don't know what the zebra numbers or settings mean? 70,80,90? I have looked everywhere and I cannot find what these numbers mean. 70 or 80 or 90 of what?I just pick a number and turn on the zebra funtion and adjust my exposure until I think it looks ok, turn off the zebra stripes and video tape. Itturns out ok but i want to know what the zebra numbers mean.I am using the Canon XH-A1.