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High-Speed Sync (FP Flash)
Check that the icon is displayed
in the viewfinder, then take the
picture.
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With normal flash. With high-speed sync.
• With high-speed sync, the Guide No. changes depending on the shutter speed (see
page 121). The faster the shutter speed, the shorter the flash range will be. Check the
current flash range on the 550EX’s LCD panel.
• To cancel high-speed sync, press the < > and < > buttons simultaneously twice
so that the icon on the LCD panel turns off.
• When high-speed sync is used in the manual flash mode, the flash output ranges from
1/1 to 1/128.
If you use fill flash in the
Av
mode with high-speed sync, you can use a faster sync
speed than the normal X-sync speed.
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