SONY A-57等低階單眼閃燈同步速度是1/160s,如快門超過這個速度,閃光燈就必需支援高速閃燈模式,並採用持續頻閃方式來搭配相機快門動作,因為這樣才能完整曝光,因採持續頻閃所以閃燈亮度大減,所以當快門速度高過這個值時,[相機][閃燈][引閃器]都必須支援高速閃光模式才行,否則就算能拍也會有很奇怪陰影,隨速度增加越來越明顯.
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