preflash

Etymology

From pre- + flash.

preflash means A flash produced in advance of the main flash when taking a picture. Lexicurio rates it Sui generis — a strength score of 87 out of 100.

noun

A flash produced in advance of the main flash when taking a picture.“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.”