Pentax 67 Operating Manual page 18

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With a coin or the shutter cocking key, set the
exposure counter control dial to correspond
with the type of film you are using. The num¬
ber of exposure will be set by this dial (120
type; 10 exposures, 220 type: 20 exposures).
• When the 120 type 6-exposure film is
used (5 exposures can be made by the
67), please make 5 blank exposures after
the 5th frame.
• Even if you have set the dial to the wrong
position, you can correct the position as
long as you have not gone past the 9 th
frame. Make sure not to correct the dial
position after the 9 th frame as doing so
causes damage to the camera.
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