First, a preflash is fired to analyze exposure. Then the flash fires during the actual exposure, creating the image. During the preflash, the camera's Evaluative metering system measures the light reflected back from the subject.
Source: wiktionary
Preflash
Synonyms for "preflash"
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.