
Originally Posted by
george013
A pre-flash is done with the shutter closed. It doesn't affect the exposure. The people in the car are sharp visible because that was only flash exposure, no other light inside.
The back of the car, that part what represents the movement, is getting darker from left to right. The flash exposure started at 1st curtain, on the image at the left side, and then the light background got ivolved, maximal on the left side and then getting less. I can't say anything of the other image, it's to small.
George