What are fast synchronization and slow synchronization in photography? Don't copy and paste, try to speak vernacular.

1, there are two concepts, one is the flash speed and the other is the camera shutter speed;

2. When shooting, these two speeds are different;

3, fast synchronization, when the camera shutter is opened, the flash flashes immediately; Slow synchronization, the camera shutter opens to the moment before the end, and the flash starts flashing. For example, two people run, one is fast and the other is slow. The so-called fast synchronization means that two people start at the same time, and the fastest person reaches the finish line first. As for slow synchronization, let the slow runner run first, and when he is near the finish line, the fast runner will start again, so that they will eventually reach the finish line at the same time.

4. Slow synchronization is mostly used for shooting night portraits, so that people and their background nights can be reasonably exposed.