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Full auto flash, Set the mode dial to

Page 97: Focus the subject, and take the picture, Taking flash pictures in each shooting mode

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Flash Photography with the EOS-Dedicated 550EX Speedlite

Full Auto Flash

This section describes how to use Full Auto E-TTL flash with ( P ) (Program AE) mode. For

instructions for operating the 550EX Speedlite, see the 550EX User’s Guide.

Set the Mode Dial to

.

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Make sure the 550EX Speedlite’s
pilot lamp is on.

Focus the subject, and take the
picture.

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Make sure the flash-ready indicator (^> is

on, and check the shutter speed and

aperture value before taking the picture.

Taking Flash Pictures in Each Shooting

Mode

Even in

(Tv), (Av), and (M) modes, E-TTL autoflash is as easy as normal picture-taking without flash.

(1) Press the shutter button down halfway to have the camera automatically set the shutter

speed or aperture value, just as in normal picture-taking without flash.

Mode

Shutter speed setting

Aperture (flash aperture) setting

Tv (Shutter-priority AE)

Manual (30 to 1/200 sec.)

Auto

Av (Aperture-priority AE)

Auto (30 to 1/200 sec.)

Manual

M (Manual exposure)

Manual (30 to 1/200 sec.)

Manual

(2) Press the shutter button down fully for E-TTL autoflash, using preflash evaluative metering

based on the aperture value set in (1).

(3) The background exposure is determined by the shutter speed and aperture value.

Flash photography in

(A-DEP) mode operates the same as in (P) mode.

# In the Easy Shooting zone (->-20), the 550EX Speedlite operates in Full Auto

mode, with the same functions as the built-in flash.

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You can set the camera to apply a fixed shutter speed of 1/200 for flash

photography in aperture-priority AE mode. (C.Fn-6 ->-126)

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