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exposure switch

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exposure switch,
(in radiology) a control device designed to interrupt the power automatically when pressure by the operator's hand or foot is released. The purpose is to prevent accidental continuing exposure of the patient to radiation. A common exposure switch is a foot pedal.


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I bias the exposure by using the under exposure switch on my Canon A1 to 1/2 (one stop underexposure) for two exposures and 1/4 (two stops underexposure) for three to four exposures.
 
 
 
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