Definition: An electronic flash unit with a light-sensitive cell and electronic circuitry that measures the light reflected back from the subject and terminates the flash when the exposure is correct.
Definition: An electronic flash unit with a light-sensitive cell that determines the length of the flash for proper exposure by measuring the light reflected back from the subject.
Definition: An electronic flash unit with a light-sensitive cell that determines the length of the flash for proper exposure by measuring the light reflected back from the subject.
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