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.