I called Canon. Basically it is the auto-gain on the small camcorders, plus the fact that I had it choked down to f5.6.
Because the depth of field on the small camcorders is very long, it can shoot at F1.8, and it does not hesitate to boost the ISO. But in order to get both the talent and backdrop in focus I had to choke the 5DM2 down to f5.6, which cut the light by 7/8ths. That plus my earlier choice of ISO 800 and it created the need for a lot of light.
So I will redesign the studio to allow for a shallower depth of field and use ISO 800. Thanks all for your help.
Norman Willis
http://www.nazareneisrael.org