Mustafa, you are one busy guy.
Emulsion, no single emulsion can give the long tone scale desired for a negative film (or a positive film for that matter) and have the desired grain structure. All films that Kodak makes are made from blends of generally 3 emulsions; a slow, medium and fast. Color films have 9 emulsions, 3 for each layer. This is a generalization of course.
In a positive film, due to the higher contrast desired, the emulsions are closer in speed than in negative films. Of course this is changed if you process a negative film to a positive or vice versa, and differs if you have a monodisperse vs a polydisperse emulsion. Polydisperse emulsions inherently have longer tone scales whereas monodisperse emulsions have shorter tone scales. Other differences lead to major differences in the design of the film itself and the shape of the curve.
A person could give a 1 week course, 8 hours / day on system design. It is a complex subject. And that would just be an introduction. It would normally be a full college course.
Hope this helps a bit.
PE |