Canon 580EX Speedlite 580EX Manual - Page 19
High-Seed, Flash - high speed sync
UPC - 013803078800
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m High-Seed Sync (FP Flash) With high-speed sync, you can use flash with all shutter speeds . This is convenient when you want to use aperture priority for fill-flash p. ortraits -er7 ~ zoom 5~mm -~ m I 03 A7 1 1.5 2 3 4 6 9 13 16 Press the C~HICC1i a Button so that is displayed . a Check that the a~Ha icon is lit in the viewfinder, s Stroboscopic flash cannot be set, s if you set a shutter speed that is th0 same or slower than the camera's maximum flash sync speed, 4 fH> wil not he displayed in the viewfinder. e With high-speed sync, the faster the shutter speed, the shorter the effective flash range will be . Check the NCO panel for the effective flash range . . TO return !a normal flash, press the < SHI fIs > button so that c m : icon turns off . 17