
Rear Curtain Sync makes your camera fire the flash at the end of the exposure. So when you press the shutter the lens open and starts collecting light and just before it closes the flash will fire to light up and freeze your main subject. Conversely Front Curtain Sync makes your camera fire the flash at the start of the exposure. For example when you press the shutter, the flash will fire immediately and the shutter will remain open afterwards capturing ambient light. Both of these methods are used in night club and action sports where the light levels are particularly low. We experimented with both of these settings and eventually having to stop due to a down pour of rain. The idea was to get the flash to highlight Luci and the ambient light of the traffic passing and city scape to create light streaks behind her.
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