I guess if you want the best results to develop in the right chemicals, what is the difference between ECN and C41? Do they have the same colour developing agent? I suppose the only thing it doesn't have that E6 has is the reversal stage? I Don't know why kodak would not use the same process for this as negative 35mm or 120? No doubt they had their reasons... I am not sure with movie film what yield your chemicals will have (i.e how many it will develop well) If you can home process it is much cheaper than sending it off to a lab...