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Canon SPEEDLIGHT 420ex Instructions Manual page 25

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When the flash mode is set to high-speed sync (FP flash), the flash can
synchronize with shutter speeds faster than the camera's fastest sync
speed. When high-speed sync is set, the
<~>
icon lights in the viewfinder.
• High-speed sync can be used in the <P>, <Tv>, <Av>, and <M> modes.
• High-speed sync is effective when you want to:
(1) Blur the background for a daylight portrait.
(2) Create a catchlight in the subject's eyes.
(3) Soften harsh shadows on the subject's face.
With FP flash.
50
70
105
With normal flash.
Set the desired picture-taking
mode.
Set the high-speed sync switch to
<~>.
25

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