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| p.1 #5 · Built in flash still firing even when set to "off" in CLS mode? |
All the preflashes, from camera and flash, don't contribute any light to the photo, because a preflash is there before the shutter opens and that is the reason it is called a preflash. But the pop-up flash gives one flash when the shutter is open and that is the the sync flash, because the flashes have to know when to fire.
You can clearly see this sync flash, when you set the camera on a 2 secs and rear: you see the preflashes and after 2 secs the sync flash or take a pic from the mirror.