3) second-curtain synchronization – Canon 380EX User Manual

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II. Speedlite 380EX with Type-A Cameras

(3) Second-Curtain Synchronization

If your Type-A camera has a Custom Function for setting second-curtain

synchronization, you can fire the flash right before the exposure ends

(when the second shutter curtain closes). Normally, first-curtain

synchronization is set so that the flash is fired at the start of the exposure

(when the first shutter curtain opens). With second-curtain

synchronization and a slow shutter speed, you can capture a moving
subject sharply and leave a blurred streak behind the subject. This is

more natural than when first-curtain synchronization is used.

* To set the camera’s Custom Function, refer to the camera’s Instructions.

Taken with second-curtain synchronization

Taken with first-curtain synchronization,

If the camera is set to the Full Auto (D) mode or a Programmed Image

Control mode, second-curtain synchronization cannot be used

To obtain second-curtain synchronization effects, set the camera to the

Tv, Av,

or M mode and use a slow shutter speed.
Setting bulb for the sync speed makes second-curtain synchronization shots
easier