Hasselblad 503CW Instruction Manual page 19

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Warning ftlark
You will find a red mark on the shutter speed scale
above the 1, I/2, and,l/4s settings. Thisls to warn
you of possible exposure effors as detailed above.
The auxiliary shutter will terminate the exposure
prematurely if you relax the pressure on the but-
ton too soon.
Listen to the buzzing sound of the delay escape-
ment in the lens' shutter and maintain the pressure
on the release button until the sound stops.
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Lens and Shutter Functions