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Canon SPEEDLIGHT 420ex Instructions Manual page 24

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M:
E-TT~ Autp'flashandManua'~::E.x-posur.e<
When you want to set both the shutter speed and aperture, use manual
exposure. E-TTL autoflash controls the flash output according to the
aperture you set. The background exposure is determined by the shutter
speed and aperture combination.
,., Set the camera's Command Dial
to <M>.
• Set the high-speed sync switch to
<e>.
" Set the desired aperture and
shutter speed.
• Turn the camera's electronic dial.
• Set shutter speed anywhere from 30
sec. to the camera's fastest sync
speed.
Take the picture.
• Focus the subject, check that the
<~>
icon is lit in the viewfinder, then
take the picture.
24

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