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The camera uses the reflected light of the test flash to
determine the light output required for the subsequent
exposure. The actual main subject can then be brought
into focus with the camera’s AF sensor/metering
window. When the shutter release is pressed, the
picture will be exposed with the previously defined light
output of the flash unit!
In Canon cameras, the flash exposure memory FE is not
supported during the green fully-automatic programme,
the Vari programme and the subject programmes!
Further details regarding settings and handling can be
found in the camera operating manual!
7 Automatic flash sync speed control
Depending on the camera model and camera mode,
the shutter speed is switched to flash sync speed when
flash readiness is reached (see the camera’s operating
instructions).
Shutter speeds cannot be set faster than the flash sync
speed, or they are switched automatically to the flash
sync speed. Various cameras have a sync speed range,
for example from 1/60 sec to 1/250 sec (see the
camera’s operating instructions). The sync speed set by
the camera depends on the camera mode, the ambient
light, and the focal length of the lens used.
Shutter speeds slower than the flash sync speed can be
set according to the camera mode and the selected
flash synchronisation.
In cameras with a between-the-lens shutter, the flash
sync speed is not controlled automatically. As a result,
the flash can be used at all shutter speeds.
