Canon IV-S2 - Manual (Page 35)

Unloading
When the Film Winding Knob no longer turns, you
have come to the end of your film roll. DO NOT
FORCE IT. Make sure to release the shutter first
and then turn the Reversing Lever from '"A" to "'R"
(Rewind). Raise the Rewinding Knob and rewind the
whole film back into its original magazine. When
you have done this, you may open the Baseplate
and take out the flm magazine. The film is now
ready for developing.
During the rewinding operation the Shutter Release
Button turns and stops the moment the film leader is
pulled off from the Take-up Spool, Rewind a few
more turns so that the leader will be drawn com­
pletely into the magazine.
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