Full Auto E-TTL autoflash used with the < > Program AE mode is
described here. For details on Speedlite 550EX operations, see the
Speedlite 550EX Instructions booklet.
Even in the , , and modes, E-TTL autoflash is as easy as normal
picture-taking without flash.
(1)
When you press the shutter button halfway, the shutter speed and
aperture are set by the camera as with normal picture-taking without flash.
(2)
When you press the shutter button completely, preflash evaluative
metering based on the aperture set in (1) is used for the E-TTL
autoflash exposure.
(3)
The background exposure is set by the shutter speed and aperture
combination.
85
Flash Photography with Speedlite 550EX

Full Auto Flash

E-TTL Autoflash in Other Shooting Modes

1Set the camera’s shooting mode

to .

2Check that the 550EX’s pilot lamp

is lit.

3Focus the subject.
4Take the picture.
•Make sure the flash-ready indicator
is on, and check the shutter speed
and aperture before taking the
picture.
Mode Shutter Speed Setting Flash Aperture Setting
(Shutter speed-priority AE)
Manual (30 sec. - 1/250 sec.)
Auto
(Aperture-priority AE)
Auto (30 sec. - 1/250 sec.)
Manual
(Manual)
Manual (30 sec. - 1/250 sec.)
Manual
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