Af-assist beam activation, When it is pressed halfway, When it is pressed completely – Canon 380EX User Manual
Page 16: Af-assist beam, Shutter button operation
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8. AF-Assist Beam
If where you focus lacks sufficient light or contrast, the Speedlite’s AF-
assist beam is emitted automatically to help the camera autofocus. The
AF-assist beam is effective from 0.7 to 10 meters (2.3 to 33 feet).
AF-assist beam activation
Depending on the camera and the active focusing point, either the camera’s AF-assist beam or
the Speedlite’s AF-assist beam is emitted. Speedlite 380EX’s AF-assist beam is linkable only
to the center focusing point. If the camera has only one focusing point (AF frame), the
Speedlite’s AF-assist beam is emitted. If the camera has multiple focusing points, the camera’s
AF-assist beam is emitted instead. With the EOS 50,EOS 50E,EOS ELAN n ,EOS ELAN n E
and EOS-1 N, Speedlite 380EX's AF-assist beam is emitted if the center focusing point is
active. See page 46.
9. Shutter Button Operation
The EOS camera’s shufter button operates in two steps: Press it halfway
or all the way.
When it is pressed
halfway:
1) Autofocus is activated to focus the
subject.
2) The exposure setting (shutter
speed and aperture) is also set at
the same time.
When it is pressed
completely:
1) The shutter is released to take the
picture and then the film advances
to the next frame.
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