Canon 580EX User Manual download pdf (Page 26)

IVIULTI Stroboscopic Flash

With stroboscopic flash, a rapid series of flashes is fired- It can be used to

capture multiple images of a moving subject in a single photograph for later

study.

You can set the firing frequency (number of flashes per sec, expressed as

Hz), the number of flashes, and the flash output.

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Press the <MODE> button so that

<MuLTi> is displayed.

Select the item to be set.

• Press the button to select the item

(blinks).

Set the desired setting.

• Turn the <©> dial to set the setting, then

press the <0> button.

► The next item to be set will blink,

• After you set the flash output and press the

•;0r. button, the entire display will turn on.

Calculating the Shutter Speed

During stroboscopic flash, the shutter should remain open until the firing

stops. Use the formula below to calculate the shutter speed and set it with

the camera.

Number of flashes -i- Firing frequency (Hz) = Shutter speed

For example, if the number of flashes is 10 and the firing frequency is 5 Hz,

the shutter speed should be at least 2 sec.

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Canon 580EX User Manual Page 26