Canon 220EX - Manual (Page 34)

Flash with Other Modes
When you want to control the
shutter speed to create a special
effect, use shutter speed-priority
AE. Set the desired sync speed
anywhere from 30 sec. up to the
camera maximum sync speed.
The camera sets the aperture
automatically to suit the back­
ground light level. The TTL aut­
oflash control system regulates
the flash output according to the
shutter speed you set for opti­
mum flash exposure.
Set the camera to Tv
(Shutter speed-priority AE)
and set the desired sync
speed anywhere from 30
sec. up to the camera max­
imum sync speed.
Press the shutter button
halfway to focus on the
subject.
Check that ^ is displayed
in the viewfinder and make
sure that the aperture
value is not blinking in the
viewfinder. Then, press the
shutter button completely
to take the picture.
32
The aperture value blinks in the viewfinder to alert you of a possible over-
exposed or underexposed background. Change the sync speed until the
aperture value stops blinking and remains displayed.