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Flash Photography with the EOS-Dedicated 550EX Speedlite
High-Speed Sync (FP Flash)
When the 550EX Speedlite is set to high-speed sync < > mode, it can automatically
synchronize at any shutter speed of 1/200 second or faster, thus providing high-speed sync
(FP) flash operation. When high-speed sync is On, the <
> icon appears in the viewfinder.
High-speed sync is effective for portrait photography in the following situations:
(1) When you want to use daylight sync flash for a portrait, and widen the aperture (reduce
the aperture value) to blur the background.
(2) When you want to produce a catchlight in the subject’s eyes.
(3) When you want to use fill flash to eliminate shadows.
Normal flash FP flash
FEB (Flash Exposure Bracketing)
By setting FEB (flash exposure bracketing) < > with the 550EX, you can bracket the flash
exposure up to +/-3 stops in 1/2-stop increments. The flash output is changed automatically for
each bracketed shot so that the background exposure level remains the same.
Standard exposure (0) Decreased exposure (–1.0) Increased exposure (+1.0)
● FEB is applied from the 550EX Speedlite. For details, see the Instractions for your
Speedlite.
● For best results use < > (single-frame shooting) drive mode. (→63)
You can set the camera to change FEB settings in 1/3-stop increments.
(C.Fn-4-1→122)