Quote Originally Posted by Craig View Post
Out of curosity then, why was Kodak's first colour material (Kodachrome) a positive material? Why was positive material even developed at all? Wouldn't it have made more sense to have made a negative film only?
Also Agfa who solved first the `Fischer-problem´ of incorporating couplers into the very layers, and who were quite surprised when Kodak presented their Kodachrome film while they were still working on a solution of the problem, started with a reversal film.
-) One driving force for them was surely motion film for cinema use. As a lot was worked on that topic then. And the most practicable way of doing would have been a neg/pos-system. (Though even a single reversal film would reduce hassle in the camera and could be copied into any other system for cine-projection.)
-) The coming of Kodachrome put them under even more pressure and as furthermore they got the impression that Kodachrome patents would block them the reversal way it was decided to go the neg/pos-way.
-) However a few months later this was revised as one thought to show up with something as soon as possible. That meant 35mm film for still-photography.
-) It took about two further years to establish a working neg/pos-system (still film/film, no paper yet).
-) It took even longer to decide the Agfacolor neg/pos system to be the future Cine standard.

From the Agfa perspective the decision between reversal and neg/pos was less a principle one but rather one of resources and time.