Slow Sync Technique Post

Definition-

Slow sync flash is just a fancy term for using your flash with a slow shutter speed. It helps you keep your subject sharp while capturing motion or a dark background. 
Slow sync is a feature available on a wide range of digital cameras that enables you to fire the flash at lower shutter speeds.
Equipment-

Light source, Tripod, Subject, Snoot, A plain and dark background, camera, A light meter, modelling light and flash light. 

Theory-

•You see, with a normal flash photo, the shutter is only open for a fraction of a second, so the flash is firing for most of your exposure.

•With a long exposure, your camera's shutter is open for much longer than the flash is firing - perhaps even several seconds.

•You can choose whether you want to fire the flash at the start or end of the exposure.

•Firing the flash at the start of the exposure is known as "front curtain" or "1st curtain". Firing it at the end is known as "rear curtain".