Canon 550 EX User Manual

Page 33

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

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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