Main switch, High-speed sync (fp flash) switch – Canon Speedlite 420EX User Manual

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Main Switch

The main switch has the following settings.

Turns off the power.

Turns on the power.

► After 90 sec. of non-use, the SE

(Save Energy) mode takes effect

automatically to turn off the 420EX

and save battery power.

• To cancel the SE mode, press the

test firing button.

High-Speed Sync (FP Flash) Switch

The high-speed sync switch has the following settings.

Sets the normal sync mode.

Sets the high-speed sync mode.

i

When the 420EX is used with a Type-A camera and the switch is set to

<V

h

>,

setting a shutter speed faster than the camera's fastest sync speed sets the

high-speed sync mode. And using a shutter speed siower than the fastest sync
speed sets the normal sync mode.
When a Type-B camera is used, the normal sync mode takes effect regardless
of this switch's setting.

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