What are examples of circumstances where rear curtain sync would be preferable to front curtain sync flash?
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3Hey, 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 02 '13 at 03:39
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is rear curtain technique 2nd and front curtain the first? – wow Apr 02 '13 at 03:42
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2For that, see What is second-curtain or rear-curtain technique? :) But in short, yes, those are synonymous. – mattdm Apr 02 '13 at 03:43
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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.
AJ Henderson
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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 02 '13 at 23:44
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@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 03 '13 at 00:55