Photographic slow shutter

1. Shoot the light track of the slow-moving vehicle. Don't let the horse fight into the picture, then don't move the camera. Take another picture where you want it. You don't have to use the slow door flash, as long as the exposure of the horse fight is normal. The last two pictures are combined.

2. The same is the slow door, one exposure, and the madou car track is taken together. At the end of the exposure, the flash is turned on. Note that the shutter time of this method should not be too long, otherwise the beans are prone to ghost, and the beans should remain basically motionless during the whole exposure time.

Use a tripod for all the above.