At one point in my career I was involved in multi-projector shows. Not at the Tokyo auto show level but not bad for folks from a cowtown. I was just a camera monkey, shooting to script in the field and then using the rostrum camera for dupes and special effects. The camera was pretty neat as it had a joystick for zooming and framing/cropping/rotating the compound and a dos (pre-windows) pc to program movements as well as a dichroic colorhead to balance the duplicating film color. I believe it was named Marron-Carrel 1600, and it could generate miles of ektachrome and litho for masks. E-6 was done in a wing-lynch. The litho in a tabletop roller transport machine, like a dentist would have had. (The thing about production work is that after you learn how to do it well, it just becomes hand work.) Anyway, another crew member would program the projectors (I think one time we did a 24 projector show). At the time, film recorders for cgi were just coming about and video projectors were starting to improve. One of the crew got the idea to register 2 of those old 3 lens video projectors to make an image bright enough to see across a large room so a show could be shown in beta sp. Thus began the ascendancy of video and the mc 1600 became a serious paperweight, at least where I was. Thanks.