What is the flash sync speed?

Flash won’t work at very fast shut­ter speeds be­cause of the way your cam­era works

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You can’t use flash across the en­tire range of shut­ter speeds. This is be­cause the fo­cal plane shut­ters used in D-SLRs achieve higher shut­ter speeds by ex­pos­ing the sen­sor through a nar­row slit be­tween the shut­ter blinds, and any flash would only hit a sliver of sen­sor. The max­i­mum flash sync speed you can use de­pends on the cam­era model and is typ­i­cally 1/200 or 1/250 sec.

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