Giz Explains: When (Not) To Use Your Camera's FlashJohn Herrman10/07/09 2:20pm1632EditPromoteDismissUndismissHideGo to permalinkWhat is photography's greatest scourge? Cellphone cameras? MySpace self-portraiture? Neither even comes close to the insidious, creeping threat that is your camera's built-in flash. Here's when and how you should—and more importantly, shouldn't—use a flash.