User Manual

Using Rear- or Second-Curtain Synchronization

When you photograph a moving subject with a slow (1/30 second or longer) shutter speed and a ash, the

ash will freeze the moving subject, and the long exposure will cause motion blur and light trails to appear in

the image, especially in low light.

This “slow-sync” ash technique, also referred to as “dragging the shutter,” can be applied in two different

ways: The ash can be synchronized with the camera’s shutter release so that it res at the beginning of the

period when the shutter opens, or it can re near the end of that period.

The former is called “front-curtain” or “rst-curtain” ash sync, and the latter is called “rear-curtain” or

“second-curtain” sync. Front-curtain sync causes motion blur and light trails to appear in front of moving

subjects, while rear-curtain sync makes them appear behind moving subjects. That means rear-curtain sync

creates a more realistic impression of movement.

The VS-570F supports rear-curtain sync modes on cameras that offer the setting. Consult your camera’s

manual to nd out how to activate it. Use your camera’s manual or shutter-priority mode to control the amount

of blurring and light trails you capture by varying the shutter speed.