Dictionary

preflash en · NOUN

Etymology

From pre- + flash.

Meanings

1. 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. 2005, Michael Guncheon, Canon EOS Digital Rebel XT/EOS 350D:

Forms