Rear Curtain Sync Edit
Some cameras offer the ability to fire the flash at just before the second curtain closes. This is called rear (or second) curtain sync, and it is used to freeze motion at the end of the exposure.
Rear curtain sync(bottom) fires the flash at the end of the exposure, after the ambient light has been recorded so the streaks trail behind the subject.
Rear curtain sync means that the flashgun fires a millisecond before the shutter closes rather than just after it opens.
Rear curtain sync - when the flash fires an instant before the second or rear curtain of the focal plane shutter begins to move. When slow shutter speeds are used, this feature can create a blur effect from the ambient light, i.e.
Using Rear Curtain Sync
This is a setting on many advanced DSLRs that causes the flash to fire just before the shutter closes instead of just after it opens.
- Modes: Auto,manual (on/off), red eye reduction, slow-speed sync, rear curtain sync, high speed sync and wireless sync with PENTAX dedicated external flash
External flash
- Hot shoe with X-contact
- X-Sync socket ...
If your system allows rear curtain synch, by all means you have to try it. It works very well with moving subjects and creates dramatic results.
This iris was dancing around in my front yard and I decided to experiment with the technique called “rear curtain sync' to capture its movement. I moved around the iris until I found a dark background for the color contrast I wanted.
This is called second curtain or rear curtain sync flash since the flash is fired about 1.5 milliseconds before the second curtain of the shutter starts to close.
Standard sync mode where the flash fires immediately after the shutter's front curtain begins its travel across the film/sensor plane. The opposite is Rear Curtain Sync.
Nikonians Photo Glossary ...
Sometimes, slow shutter speeds are purposely used with "rear curtain sync" (the strobe is triggered at the close of the shutter cycle rather than the beginning) so as to create intentional blur behind the moving subject to give the illusion of ...
 See also: Shutter, Shutter speed, Speed, Flash, Photograph
  
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