Canon 220EX - Manual (Page 17)

Flash with Other Modes
When you want to control the
depth of field or when you want
the background to be correctly
exposed, use aperture-priority
AE. Set the desired aperture
and the camera sets the shutter
speed automatically to suit the
background light level. The E-
TTL autoflash control system
regulates the flash output
according to the aperture you
set for optimum flash exposure.
Set the camera to Av
(Aperture-priority AE) and
set the desired aperture.
The shutter speed blinks in the viewfinder to alert you of a possible over­
exposed or underexposed background. If the maximum sync speed
blinks, the background will be overexposed. If the 30“ sync speed blinks,
the background will be underexposed. Change the aperture setting until
the sync speed stops blinking and remains displayed.
16
Make sure that the pilot
lamp is lit.
Press the shutter button
halfway to focus on the
subject.
Check that ^ is displayed
in the viewfinder and
make sure that the shutter
speed is not blinking in
the viewfinder. Then,
press the shutter button
completely to take the pic­
ture.