My God. This thread brings back some interesting memories. I spent almost 8 years as an offset camera operator. Not only did I shoot thousands of B&W halftone negatives from B&W prints, and drawings, but I also did 4 color seperations on a process camera. The camera took up two rooms (one was a dark room) had a copy board that was 40x50 inches, and a film back that was 30x40 inches. It also had four dual tube pulsed xeon lights to illuminate the art work. A single color seperation could take up to 3 to 4 hours.