What are front and rear cur­tain sync ?

NPhoto - - Nikon Skills -

When you re­duce the shut­ter speed set­ting on your cam­era it makes a dif­fer­ence whether you have the flash fir­ing at the be­gin­ning (front) or the end (rear) of the ex­po­sure. Sports pho­tog­ra­phers pre­fer to use rear as it means the am­bi­ent light will reach the sen­sor first and then the flash is pinged over the top. If it’s cap­tured the other way around the am­bi­ent blur looks like it’s go­ing in the wrong di­rec­tion. With front and rear cur­tain sync, the longer the shut­ter speed you use, the more you’ll no­tice this am­bi­ent blur ef­fect.

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