Mamiya C330S: Page 29
Multiple Exposures/Precautions on Shutter Ops. 29 
Turn the multiple exposure dial
(28)and set the word 'MULTI' to
the red dot, then the double exposure prevention is disengaged. The shutter button can be depressed without advancing the film, whenever the shutter is cocked manually.
Upon finishing photography, be sure to set the word 'SINGLE' of the dial back to the red dot.
When photographing is suspended with the shutter button depressed halfway, it very rarely happens that the shutter button cannot be depressed on the next attempt. In this case, the shutter can be released by setting the 'MULTI' to the red dot, without needlessly advancing the film.
Precautions on Shutter
Operations
In any of the following situations, the safety mechanism prevents the shutter release button from being depressed.
1.When the triangle mark of the lens lock knob points to UNLOCK. Red warning mark will appear on the ground glass focusing screen in the finder.
2.When the triangle mark on the shutter release lock is set to 'L'.
3.When 'SINGLE' on the multiple exposure dial is set to the red dot, and...
(1)When film is not loaded (exposure counter indicates '0').
(2)When the film has not been wound completely.
(3)When the shutter release button has already been pressed.
(4)When the last film in roll is exposed (after 12 or 24 exposures).
To freely release the shutter or for multiple exposures, set the multiple exposure dial so that the 'MULTI' matches the red dot.
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