Slow Sync Flash Photography

1. Shoot with flash  or shoot with slow shutter speed 
2. Flash: your subject can be too bright and the background can be dark because there isn't enough time to capture ambient light. Slow Shutter: a moving subject could mean motion blur 
3. Slow Sync Flash
4. Rear Curtain Sync: the flash fires at the end of the exposure right before the curtain closes to freeze the subject at the end of the shot. Front Curtain Sync: the flash fires at the beginning of the exposure and spends the rest of the exposure capturing ambient light