Rear-Curtain Sync

You can set your flash (built-in or external speedlight) to fire during a long exposure. This is useful when you want to still see your background when using a flash (i.e. when you need to compensate for the inverse square law).

Depending on what you're going for, you have the choice of either front-curtain (AKA first curtain) sync or rear-curtain (AKA second curtain) sync.

Click HERE to see a super-cool slow-motion demonstration of how your front and rear curtain work.

See image below. Rear-curtain sync means the flash fires at the very end of a long exposure, thus freezing any moving elements in their "final" place.

Source: (http://www.exposureguide.com/high-speed-sync-flash.htm)

These are two fantastic tutorials that show how to use this feature in the field. You must know how to set this and use it!

VIDEO TUTORIAL: Understanding Rear-Curtain Sync (7:17)

EXAMPLE:

(Source: http://www.slrlounge.com/school/capturing-motion-with-direct-flash-and-shutter-drags/)

STUDENT EXAMPLES:

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