Canon Speedlite 420EX User Manual download pdf (Page 21)

Flash in Other Picture-Taking Modes

: E-TTL Autoflash and Aperture-Priority AE

When you want to control the depth of field or when you want both the

subject and background exposed correctly, use aperture-priority AE. You

set the aperture, and the camera sets the shutter speed automatically to

expose the background correctly. The E-TTL autoflash exposure is based

on the aperture you set.

Set the camera's Command Dial

to < > (aperture-priority AE).

• Set the high-speed sync switch to

<>.

Set the desired aperture.

• Turn the camera's electronic dial to

set the aperture.

Take the picture.

Focus the subject, check that the < >

icon is lit in the viewfinder, then take

the picture.

If the camera's fastest sync speed blinks, the background will be overexposed. If

the sync speed blinks, the background will be underexposed. Change the

aperture setting until the sync speed stops blinking.

In low-light conditions, a slow sync speed is set automatically. A tripod is

recommended for slow sync speeds.

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Canon Speedlite 420EX User Manual Page 21