Canon SPEEDLITE 420EX Instructions Manual page 18

Flash in Other Picture-Taking Modes
'You can also use TTL autotash with the camera set to <Av> (aperture-
prionty AE), <Tv> (shutter speed:priorty AE}, or <M> (manual)
'Shutter Speed and Aperture Settings According to Mode
Mode 'Shae Speed [Fasieware
(Program AE) [Asoo nae) [Asma
'Av (hoeriasewenty AE) | Auioracay swt GO awe Tame) | Maran wt
Tv (Suter spect prontyAE)| _ Marualy wat (90sec =n ac) | Arata et
M (Manat Mary ot Ah 20sec Toye) | Mary aot
+ Automatically so: Set by the camera.
* x woe: Gamera' fastest syne speed. (page 52)
B -wtn Type-8 cameras, ne <> sich doos rot funeson.
*W hash fs used te <DEP> (ptr of eld AE} mode wilbe he same
'ang lash nthe <P> (Progam AE) moos,
4
'Av: TTL Autofiash and Aperture-Priority AE
When you want to control the depth ot field or when you want both the
subject and background exposed correctly, use aperture-prionty AE, You
sel the aperture, and the camera sets the shutter speed automaticaly 10
expose the background correctly. The TTL autollash exposure is based on
the aperture you set.
'Set the camera to <Av> (aperture-
prlorty AE},
Set the desired aperture.
+ Turn the camera's oloctoric dal 1
set the aperture,
RE
9 2 "Re a
carte
pS
© inte carers taster: sync speed inks: the background wil be overexposed I
{te 37" sy speed Birks, te background wil be underexposed, Change tho
'aperture settng unl the sync speed stops Biniing,
35