Film “S” is a film used by motion picture professionals for sound recording, an use which requires very fine grain and ultra high definition. This sharpness is guaranteed by a special anti-halation layer located between the film’s base and the emulsion layer, while its usually in back layer for ordinary films.
This film is not completely red sensitive and it can affect the result of your pictures. The sky can easily be overexposed. You should use diffuse light if you want to reduce contrast.
The use of the recycled film cassette is not recommended with full automatic/motorized camera.