Flash Photography with Speedlite 550EX

High-Speed Sync (FP Flash)

When the Speedlite’s high-speed sync lamp ( ) is on, high-speed sync (FP or focal-plane flash) is enabled automatically. The Speedlite can then synchronize at all shutter speeds, even those faster than 1/200 sec.

When high-speed sync is enabled, is displayed in the viewfinder to indicate high-speed sync.

High-speed sync is effective in the following cases:

(1)When you want to use fill-in flash for a portrait and maintain background blur with a large aperture.

(2)When you want to produce a catchlight in the subject’s eyes.

(3)When you want to use fill-in flash to eliminate shadows

With conventional flash.

With FP flash.

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Image 94
Canon EOS-3 manual High-Speed Sync FP Flash