Canon DS-8 - Manual (Page 38)

Film Rewinding Mechanism
Film rewinding is powered by motor. The footage of the rewound
film can be ascertained up to a single frame by the frame counter.
1 While pressing the rewinding safety button, slide and set the
variable shutter control lever at "R”.
n By depressing the shutter release button, the film starts wind-
^ ing in reverse with the shutter leaves being closed. The frame
counter also rotates in reverse.
Frame Counter
The frame counter is used when performing overlapping or single
frame photography. One rotation of the frame counter equals 72
frames (one foot), and its indicator couples to the advance or
reverse operation of film.
The frame scale is movable and can be set at “0" position at the
indicator by turning the frame counter set ring. Thus, match "0" of
the scale with the indicator first, and then perform fade-in. Read a
number of the frame and rewind the film to "O” as is. By fading
in, the overlap can be made precisely and completely.
Generally, the use of 72 frames or less is advisable in fading tech­
niques.