Canon SPEEDLITE 420EX Instructions Manual page 12

'Slow-Speed Syne for Dark Backgrounds
By using a slow syne speed with Hash, you can correctly expose both the
subject and a dark background. For aulomatic low-speed sync, sat the
'camera to the < Av> moda,
'When using slow-spaed sync. use a tripod to prevent camera shake,
1) To cba a boner sftfocus lect set the aperture marly toward he
'maximum opening.
2) Sate srt speed as sow as poate whe preventng camera shake
3) Check tat the fash sendy, ten taka he pcre.
2
Flash in Other Picture-Taking Modes
ree eee
Tv: E-TTL Autoflash and Shutter Speed-Priority AE
|When you want to use the shutter speed to create a certain etfct, set the
'camera o shutter speed-prionty AE. In his mode, you set the shutter
'speed anywhere from 30 sec. 10 the camera's fastest sync spoed. The
camera then sets the aperture automaticaly to obtain the correct
'background expesure. E-TTL autolash controls the flash output based on
'he set aperture,
'Sot the camera's Command Dial
to<Wv>.
+ Sot the high-speed sync switch to
<*>
'Sot the desired shutter speed,
Turn the camera's electronic dal to
201 the shutter spoed,
+ Sot the shutter speed anywhere from
30 sec. fo tho camera's fastest sync
speed.
Take the picture.
Focus the subject, check that the
<> icon is itm the viewinder, then
take the picture
FE we mnmum apenure setng Binks, te background willbe overexposed,
'he macinum aperture seting Dis, tse backgroutc wil be undererposed
(Charge he shor speed url the aperture sang stops binking,