Ask questions about synchronous photography in Hou Lian.

Flash photography exposure has nothing to do with shutter speed (dark environment under synchronous file), but only flash exponential distance and aperture affect exposure.

When it comes to low-light photography, the flash can be used as a supplementary light or as the main light.

Four seconds can't get a clear image of the moving vehicle at close range, and it comes out early, so it should flash before the Hou Lian closes. You can't wait four seconds for the car to come out of the viewfinder.

For example, the light of 24GN is fully illuminated, the distance between the car and the flash is 6 meters, and the aperture F4 is the correct exposure. The speed depends on how far the lights need to move on the screen. You must flash and close the shutter before the car leaves the screen, such as 30 or 2. The exposure of the car is normal, which only affects the imaging length of the car lamp on the screen and the brightness of the environment.