cHigh-speed Sync

With high-speed sync, the flash can synchronize with all shutter speeds. This is convenient when you want to use aperture-priority AE for fill-flash portraits of a subject.

Display <c>.Press function button 4 <Y> to display <c>.Check that <F> is lit in the viewfinder.

When using the flash with EOS cameras compatible with E-TTL and released up to 2011, high-speed sync is not possible with radio transmission wireless flash shooting (p.51).

With high-speed sync, the faster the shutter speed, the shorter the effective flash range will be. Check the effective flash range on the LCD panel.

If you set a shutter speed that is equal to or slower than the camera’s maximum flash sync speed, <F> will not be displayed in the viewfinder. To return to normal flash shooting, press function button 4 <Y> to turn off <c>.

High-speed sync is not available during stroboscopic flash.

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