High-Speed Sync - Canon Speedlite 470EX-AI Instruction Manual

c High-speed Sync
With high-speed sync, you can shoot with a flash even at shutter
speeds that exceed the maximum flash sync shutter speed. This is
effective when you want to shoot in the aperture-priority AE <f>
mode (open aperture) with background blur in locations such as
outdoors in daylight.
With high-speed sync, the faster the shutter speed, the lower the guide
number becomes. You can check the effective flash metering range on the
LCD panel.
When the shutter speed is less than or equal to the maximum flash sync
shutter speed, <F> is not displayed in the viewfinder.
To return flash firing to normal, select <2> (first-curtain sync) in step 3.
(<2> will not be displayed on the LCD panel after you perform this
setting.)
32
Press <8>.
1
Select the item in the illustration.
2
Turn <9> to select the item in the
illustration, then press <8>.
Select <c>.
3
Turn <9> to select <c>, then press
<8>.
Check that <F> is lit in the
viewfinder, then take the picture.