Canon 550EX User Manual

Page 33

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High-Speed Sync (FP Flash)

Check that the icon is displayed

in the viewfinder, then take the

picture.

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 0S 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.