>>4055544Before digital cameras, film was used for deep sky astrophotography. Usually it was for scientific purposes, black and white (Kodak technical pan), and required that the film be "hyperized" before use. Hyperization is a process where the emulsion is impregnated with hydrogen under high pressure, increasing its light sensitivity minimal grain.
Honestly though since films like Ilford Delta 3200 and Kodak P3200, I don't think hyperization is all that practical. For color though, since there aren't any high speed color film stocks, you'd have to hyper to counteract the reciprocity failure and lower exposure times.
Its all possible but you need to be specific in your calculations.
These links are helpful, albeit ancient information:
https://www.astropix.com/html/astrophotography/films.htmlhttps://astropix.com/html/astrophotography/hypering.html 