Pentax IQZoom80G Operating Manual page 21

Rewinding a film in mid-roll
If you wish to unload a film before exposing all
the frames, push the mid-roll rewind button
with the protrusion part of the strap clamp.
• The lens retracts and then film rewinding
starts.
• When rewind is completed, the motor stops
and [ u ] blinks, indicating that the back
cover may be opened safely.
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