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This question already has an answer here:

What are examples of circumstances where rear curtain sync would be preferable to front curtain sync flash?

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Hey, we have a lot of good answers to many of these questions already. They're not bad questions, but maybe you could spend a little time looking before asking? If there's something in an existing question or answer you don't understand, feel free to as a new followup question referring to that one. –  mattdm Apr 2 '13 at 3:39
    
is rear curtain technique 2nd and front curtain the first? –  wow Apr 2 '13 at 3:42
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For that, see What is second-curtain or rear-curtain technique? :) But in short, yes, those are synonymous. –  mattdm Apr 2 '13 at 3:43
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marked as duplicate by mattdm, MikeW, Paul Cezanne, John Cavan, thomasrutter Apr 2 '13 at 23:42

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

1 Answer

Second curtain sync is used when you want to get natural motion where light trails lead to an image as opposed to leading away from it. Normally a flash will go off at the start of a shutter (which is normally longer than the time the flash is active.) This results in a heavily exposed image followed by a trail of light. Second curtain reverses this by making the flash go off at the end so you get a trail of light leading to the more heavily exposed moment of time.

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I think you may have it the wrong way around. With a normal flash, the trails will be in front of a moving object and with a rear curtain flash, they'll be behind. If that's what you meant, then sorry but I misunderstood. –  thomasrutter Apr 2 '13 at 23:44
    
@thomasrutter - yes, that is what I meant. Second curtain, the light trails lead to the image (ie, they look like the object is moving in the direction it is actually moving). –  AJ Henderson Apr 3 '13 at 0:55
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